ライフサイエンスコーパス: ylide

1 d ortho-substituted arenes on the azomethine ylide.

2 t reported [3+3]-cycloaddition of a carbonyl ylide.

3 displacement of a nitro group or an iodonium ylide.

4 sfer to generate a more stable S-aryl sulfur ylide.

5 addition of the in situ generated azomethine ylide.

6 tropic rearrangement of an in situ generated ylide.

7 arrangement of a nitrile-stabilized ammonium ylide.

8 and by isolation of its trimethylphosphonium ylide.

9 ion present in the base used to generate the ylide.

10 aldehyde 19 with an amide-stabilized sulfur ylide.

11 e intramolecular syn-beta-elimination of the ylide.

12 enolide found in (1) via use of the Bestmann ylide.

13 he substitution pattern of the oxidopyrylium ylide.

14 ipolar cycloaddition chemistry of azomethine ylides.

15 nd 1,2,4-triazoles are precursors of nitrile ylides.

16 s/Sommelet-Hauser rearrangements of ammonium ylides.

17 Amines do not stabilize [3 + 2] ammonium-ylides.

18 phile-specific parameters N and sN for these ylides.

19 nd triflates with alpha-carbonyl sulfoxonium ylides.

20 lecules capable of being trapped by carbonyl ylides.

21 f aryl thiols and alpha-carbonyl sulfoxonium ylides.

22 tion of Michael acceptors with chiral sulfur ylides.

23 ddition reactions by and with the phosphorus ylides.

24 e advantageous safety profile of sulfoxonium ylides.

25 -substituted enoldiazo compounds with sulfur ylides.

26 s involves a catalytic asymmetric azomethine ylide 1,3-dipolar cycloaddition followed by an intramole

27 ck cyclization and intramolecular azomethine ylide 1,3-dipolar cycloaddition toward the total synthes

28 As ambident nucleophiles, ylides 1 and 2 can react at oxygen as well as at the alp

29 ophilicity parameters 4 < N < 8 for iodonium ylides 1(a-d) derived from these correlations show that

30 The iodonium ylides 1(a-d) thus have nucleophilicities similar to tho

31 of the beta-dicarbonyl-substituted iodonium ylides 1(a-d) with several pi-conjugated carbenium and i

32 hesis include an enantioselective azomethine ylide (1,3)-dipolar cycloaddition reaction to set the ab

33 The nitrile ylides 15 are characterized by IR spectroscopy in conjun

34 /tetrazolo[1,5-a]pyrazines generates nitrile ylides 15 via pyrazinylnitrenes 13 and triazacycloheptat

35 Nitrile ylides 15a and 15b (R = H or Cl, R' = H) have allenic st

36 Nitrile ylide 15c (R = R' = CH3) has a distinctly propargylic st

37 zirene (21): one (path a) leading to nitrile ylide (17) and the major products styrene and acetonitri

38 The reaction of cinnamaldehyde with iodonium ylide 1a catalyzed by (5S)-5-benzyl-2,2,3-trimethyl-imid

39 ne-derived iminium ion 10a with the iodonium ylide 1a with the rate constant calculated by eq 1 sugge

40 methanol with a 266 nm laser produces mainly ylide 2 (lambda(max) ~ 380 nm, tau ~ 6 mus, acetonitrile

41 Ylide 2 is formed via singlet reactivity of 1, and calcu

42 show that the rate of the Wittig reaction of ylide 2 with aldehyde 14 is significantly faster than th

43 n of the stable ninhydrin-derived azomethine ylide [2-(3,4-dihydro-2 H-pyrrolium-1-yl)-1-oxo-1 H-inde

44 CH horizontal lineCH-Acc, 2) with pyridinium ylides 3, sulfonium ylide 4, and sulfonyl-substituted ch

45 s, including the formation of two azomethine ylides, [3 + 2]-cycloaddition, 1,3-sigmatropic rearrange

46 opic rearrangement of sulfonium and selenium ylides (39 examples, up to 99% yield).

47 as primary photoproducts and also to nitrile ylide 4 and 2,5-dimethyloxazole (5).

48 5-electrocyclization of the carbonyl nitrile ylide 4 and its structural nature (propargyl-like versus

49 Thus, the elusive carbonyl nitrile ylide 4 was captured and characterized for the first tim

50 -Acc, 2) with pyridinium ylides 3, sulfonium ylide 4, and sulfonyl-substituted chloromethyl anion 5.

51 intramolecular N-H insertion of sulfoxonium ylide 41 and conversion of ketone 32 to amine 31 in a si

52 formation of triplet vinylnitrene 4 but also ylide 5 (lambda(max) at 440 nm, tau = 13 mus).

53 Ylide 5 reacts with water to provide [P(3)O(8)Me](2-) (6

54 a maximum at 320 nm due to the formation of ylide 8, which has a lifetime on the order of several mi

55 of 1b in cryogenic argon matrixes results in ylide 8.

56 The supernucleophilic character of ylide accounts for the feasibility of the initial nucleo

57 Treatment of the U(III)-ylide adduct U(CH(2)PPh(3))(NR(2))(3) (1, R = SiMe(3)) w

58 ma-lactones from the reaction of sulfoxonium ylides, aldehydes, and ketenes is described.

59 n-stabilised, semi-stabilised and stabilised ylides all occur under kinetic control by a common mecha

60 The unsubstituted pyridine-derived ylides allow functionalization of primary C-H bonds, whi

61 ized and used as the source of oxidopyrylium ylide, although the generality of this process remains u

62 tigating the synthesis of N-alkoxyazomethine ylides, an unexpected aminal byproduct was generated dur

63 olefination using a nonstabilized phosphorus ylide and a stereoselective Heck cyclization.

64 polar cycloaddition with a simple azomethine ylide and a variety of vinyl fluorides and vinyl difluor

65 st control was conserved across a variety of ylide and amine coupling partners.

66 le the synthetic advantages of a phosphonium ylide and an iodonium salt.

67 essful trapping of the postulated azomethine ylide and azaquinone methide intermediates.

68 reaction of the in situ generated phosphorus ylide and ketenes.

69 tituent, the reaction between the azomethine ylide and the alkene stops at the first step, leading to

70 ergo a subsequent decomposition onto nitrile ylide and urea.

71 from the corresponding beta-keto sulfoxonium ylides and anilines in the presence of TiCl(4) as a Lewi

72 overed in the cycloaddition of oxidopyrylium ylides and butadiene.

73 Notably, a broad range of oxidopyrylium ylides and cyclic imines participate in this novel heter

74 cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio

75 ddition reaction of nonstabilized azomethine ylides and cyclic N-sulfonyl imines has been developed p

76 rmation is nonreversible with semistabilized ylides and diastereoselectivities are determined in the

77 e in reactions of triphenylphosphine-derived ylides and has previously been observed for reactions un

78 n of HNO with triarylphosphines provides aza-ylides and HNO-derived amides, which may serve as stable

79 n, whereas the difference between azomethine ylides and imines is related to lower interaction energi

80 tion reactivities of 24 mesoionic azomethine ylides and imines were investigated using density functi

81 tegy exploited the diverse reactivity of aza-ylides and imines, and featured eight different macrocyc

82 ic (3 + 2) cycloadditions between azomethine ylides and nitroalkenes, followed by catalytic hydrogena

83 se (3 + 2) cycloadditions between azomethine ylides and pi-deficient alkenes.

84 y reaction to access oxazolines using sulfur ylides and stable precursors of acyl imines.

85 polar cycloaddition of stabilized azomethine ylides and sugar enones (dihydropyranones) derived from

86 -cycloaddition of enoldiazoacetates with aza-ylides and their selective coupling with nitrogen and ox

87 compounds to HNO (trapped as a phosphine aza-ylide) and the corresponding barbituric acid (BA) byprod

88 yclization partners (nucleophile, azomethine ylide, and dipolarophile), and further derivatization of

89 between a novel type of ylide, i.e. nitrone ylides, and alkenes has been carried out.

90 he unequivocal identification of the nitrile ylide anti-4, which was transformed into oxazole 5.

91 4-Pyrrolidinopyridine-containing ylides are capable of C-H functionalization in acyclic m

92 1-Aminopyridinium ylides are efficient directing groups for palladium-cata

93 Imidoyl sulfoxonium ylides are presented for the first time as potential pre

94 appendages of the approaching maltol-derived ylides are privileged by higher barriers for dimerizatio

95 [1,2]-sigmatropic rearrangements of ammonium ylides are studied by a combination of experimental, sta

96 s, provides proof of principle that iodonium ylides are suitable substrates for iminium-activated cyc

97 Although sulfur ylides are textbook reagents in organic synthesis, surpr

98 N-Aminopyridinium ylides are used as monodentate directing groups for copp

99 Oxidopyrylium ylides are useful intermediates in synthetic organic che

100 ongest superbases ever measured (phosphonium ylides) are reported, and by employing these compounds,

101 ishes the value of underutilized aziridinium ylides as key intermediates for converting small, strain

102 predicted azaquinone methides and azomethine ylides as the reactive intermediates and showed that imi

103 trated the utilization of fluorinated sulfur ylides as versatile reagents for Corey-Chaykovsky cyclop

104 initial nucleophilic attack of the iodonium ylide at the iminium ion is rate-determining.

105 the steric demand of the substituent in the ylide-backbone on the catalytic activity.

106 pture in aprotic nucleophilic solvents (with ylide bands at 1625 cm(-1) in acetonitrile and 1586 and

107 The new ylide-based method provides access to gamma-lactones fro

108 step (11)C-labelling process and an iodonium ylide-based radiofluorination.

109 ittig olefination of a stabilized phosphorus ylide bearing an omega-hemiacetal.

110 bstituted enoldiazoacetates and imido-sulfur ylides by asymmetric [3+1]-cycloaddition using chiral sa

111 s of alpha-carbonyl-alpha'-amide sulfoxonium ylides by Pd/C-catalyzed carbonylative transformation of

112 lace via donation of electron density of the ylide carbon to the carbonyl carbon of benzaldehyde at a

113 thesis of increasing pyramidalisation of the ylide-carbon, highlighting the increasing dominance of E

114 mechanism while leaving behind the borenium ylide CB(11)(CH(3))(11), which is a strong Lewis acid an

115 tered ring structure, both having azomethine ylide character.

116 ctions of all of the three major phosphonium ylide classes (non-stabilized, semi-stabilized, and stab

117 ybrids by reaction of N-metalated azomethine ylides [Cu(II) or Ag(I)] with the appropriate chiral lig

118 a rhodium-catalyzed intramolecular carbonyl ylide cycloaddition reaction for the first time.

119 Padwa's nitrile ylide cycloaddition to dimethylfulvene (1978) gave [6+4]

120 ycloaddition of sugar enones with azomethine ylides derived from natural amino acids.

121 0]fullerene on the Re face of the azomethine ylide directed by the steroidic unit.

122 N-Aminopyridinium ylide-directing group is employed for copper-promoted ch

123 s with high ee and that stabilized sulfonium ylides (e.g., ester-stabilized) reacted with cyclic enon

124 ly been found that semi-stabilized sulfonium ylides (e.g., Ph-stabilized) reacted with cyclic and acy

125 The use of N-iminopyridium ylide enables a similar iminocyclization reaction to giv

126 The nitrile ylides exist in the matrices in the Z,Z-conformations in

127 he carbonyl group with tetrahydrothiophenium ylide followed by coupling with primary amines.

128 lization of 2-azabutadiene into 7aH-indolium ylide followed by prototropic shift.

129 omponent [3 + 2] cycloaddition of azomethine ylides followed by CuI-catalyzed cascade trifluoromethyl

130 ed heating they isomerize into 7a H-indolium ylides, followed by a barrierless 1,5-prototropic shift

131 wed by a highly stereoselective Cu-catalyzed ylide formation and then a [1,2]-Stevens rearrangement.

132 tion state involving a two-point attachment: ylide formation between the alcohol oxygen and the carbe

133 We provide direct spectroscopic evidence for ylide formation by singlet alpha-carbonyl carbene captur

134 t in tandem reactions, consisting of oxonium ylide formation followed by [2,3]-sigmatropic rearrangem

135 gmatropic rearrangement, as well as nitrogen ylide formation followed by azetidine ring expansion.

136 participate in bimolecular reactions such as ylide formation with nucleophiles.

137 opropanation and subsequent ring expansions, ylide formation with subsequent rearrangements, and C-H

138 f five distinct steps: rhodium-bound oxonium ylide formation, [2,3]-sigmatropic rearrangement, oxy-Co

139 rogen insertion reactions, cyclopropanation, ylide formation, Wolff rearrangement, and cycloaddition

140 Rh(II)-catalyzed oxonium ylide formation-[2,3] sigmatropic rearrangement of alpha

141 rated acetal leads to hyperolactone C, where ylide formation-rearrangement proceeds with high selecti

142 , cyclopropanation, cyclopropenation, sulfur ylide formation/2,3-sigmatropic rearrangement, as well a

143 The tandem ylide formation/[2,3]-sigmatropic rearrangement between

144 erated from enoldiazoacetamides and carbonyl ylides formed from intramolecular carbene-carbonyl cycli

145 Azomethine ylides, formed in situ via decarboxylative condensations

146 larophiles with in situ generated azomethine ylides from l-proline or acenaphthenequinone, formation

147 catalytic formation of versatile pyridinium ylides from metal carbenes has been poorly developed; th

148 are the precursors of N-metalated azomethine ylides from which up to four new chiral centers can be g

149 precedented substrate scope for the ammonium ylide functionality, and products are generated in high

150 methyl vinyl ketone (MVK): ketone-stabilized ylide gave 25% ee, ester-stabilized ylide gave 46% ee, a

151 abilized ylide gave 25% ee, ester-stabilized ylide gave 46% ee, and amide-stabilized ylide gave 89% e

152 ized ylide gave 46% ee, and amide-stabilized ylide gave 89% ee.

153 ration of rGO via the addition of azomethine ylide generated from the ferrocenecarboxaldehyde oxime.

154 e of 1,3-dipolar cycloaddition of azomethine ylide generated in situ from ninhydrin and (thia)proline

155 thyl groups that makes use of a thiocarbonyl ylide generated in situ.

156 +2] cycloaddition of unstabilized azomethine ylides generated from readily prepared trimethylsilyl-su

157 ycloaddition of 2 H-azirines with azomethine ylides generated in situ from isatins and alpha-amino ac

158 ugh the Stevens rearrangement of a sulfonium ylide, generated in situ from the coupling of a copper-c

159 tive 1,3-dipolar cycloaddition of azomethine ylides, generated from bis-aziridinedicarboxylate, to C6

160 Haack cyclization, followed by an azomethine ylide generation and intramolecular cycloaddition.

161 ed as the amine component for the azomethine ylide generation.

162 his process is employed in a tandem ammonium ylide generation/[2,3]-rearrangement reaction, which for

163 yde is used in the presence of an azomethine ylide, giving the corresponding highly substituted pyrro

164 oic acid group directly above the azomethine ylide group.

165 l theory), including previously unreported N(ylide)- H(cyclopropene) second-orbital interactions.

166 of the dimethyl triflate precursor with the ylide H2CPPh3 produced the mononuclear group 5 methylidy

167 ubstitution on the nitrile carbon of nitrile ylides has a profound effect on their structure.

168 addition reactions of N-metalated azomethine ylides has also been demonstrated by highly enantio- and

169 gioselective [2,3]-rearrangement of iodonium ylides has been developed as a general solution to catal

170 on of azides with alpha-carbonyl sulfoxonium ylides has been studied.

171 substrates using alpha-carbonyl sulfoxonium ylides has not been so far investigated, despite the pot

172 ted enoldiazoacetates with alpha-acyl sulfur ylides, has been developed.

173 g from phenolic Mannich bases and pyridinium ylides, has been developed.

174 In particular, vinylsulfonium ylides have been neglected so far.

175 ly than the regioisomeric allomaltol-derived ylide (i.e., with a para methyl substitution relative to

176 r findings that maltol-derived oxidopyrylium ylides (i.e., with ortho methyl substitution relative to

177 tudy of the reaction between a novel type of ylide, i.e. nitrone ylides, and alkenes has been carried

178 n of a hydroxyquinone-derived phenyliodonium ylide in the presence of visible light using experiment

179 3-pyrrolyl BODIPY with different alkyl/aryl ylides in CH2Cl2 at room temperature for 2 h followed by

180 rearrangement of nitrile-stabilized ammonium ylides in conjunction with the reductive removal of the

181 reaction of vinyl benzoxazinones and sulfur ylides in good yields and good enantioselectivities.

182 eful alpha-carbonyl-alpha'-amide sulfoxonium ylides in high efficiency.

183 rboxyl donor and the involvement of a unique ylide intermediate as the carboxyl acceptor in the CmoA-

184 The key sulfur ylide intermediate for the rearrangement was formed by t

185 2]-alkyl shift within the postulated oxonium ylide intermediate.

186 f C-H activation, migratory insertion of the ylide into the carbon-metal bond, and protodemetalation,

187 An example of converting the obtained ylide into the corresponding 1,3-dicarbonyl compound has

188 The formation of the [3 + 2] phosphorus-ylide is exergonic, and hence, the [3 + 2] cycloaddition

189 This class of sulfur ylide is successfully obtained from imidoyl chloride and

190 arrangement of a nitrile-stabilized ammonium ylide is the key step of a very short and practical synt

191 -substituents in the case of semi-stabilized ylides is confirmed and is accommodated by the cycloaddi

192 tive [2,3]-rearrangement of allylic ammonium ylides is described.

193 pha-carbonyl-alpha'-(hetero)aryl sulfoxonium ylides is needed to benefit more greatly from the potent

194 cycloaddition of nitroalkenes and azomethine ylides is reported using a P,N-type ferrocenyl ligand an

195 ctive S-H insertion reactions of sulfoxonium ylides is reported.

196 A cascade sequence involving azomethine ylide isomerization followed by Mannich cyclization form

197 the greatest extent with the most stabilized ylide (ketone).

198 a diazo ketone, with an ether to produce an ylide-like intermediate that rearranges to produce E- or

199 The reactivity of ylide-like phosphasilene 1 [LSi(TMS) horizontal lineP(TM

200 benzyl ether derivative to asymmetric sulfur ylide-mediated epoxidation with up to 92% ee (14 example

201 p to 200 cm(-1) in the IR absorptions of the ylide moieties.

202 from the polarization of the P=C bond in the ylide (n(O) -> pai(P=C)(*)), clamps the P=C and C=O bond

203 with azides, nitrones, azomethine imines and ylides, nitrile oxides, diazo compounds, and other dipol

204 -dienoate as a dipolarophile with azomethine ylides, nitrones, and nitrile oxides in good yields.

205 Thermal decomposition of the phenyliodonium ylide of lawsone gives rise to a highly reactive cyclic

206 de-mediated reaction between cyclic iodonium ylides of 1,3-dicarbonyls and 3-alkylidene-2-oxindoles r

207 initial electrophilic attack of the iodonium ylide on the C(beta) position of the diphenylketene, fol

208 reaction of an in situ generated azomethine ylide onto a cyclopropene.

209 med by addition of a COOEt-stabilized sulfur ylide onto the Michael acceptor.

210 e cyclizations of alpha-carbonyl sulfoxonium ylides onto benzenes, benzofurans and N-p-toluenesulfony

211 lar cycloadditions of N-metalated azomethine ylides onto C60 yielding a full stereodivergent synthesi

212 as a four-atom component, and Corey's sulfur ylide or ethyl bromoacetate acts as a one-atom carbon so

213 al 1,3-dipolar cycloaddition between nitrile ylides or nitrilium triflates and imines.

214 nt H(2)CPPh(3) (4 equiv) provides phosphorus ylide [P(3)O(8)CHPPh(3)](2-) (5) in 61% yield as a mixed

215 e find no evidence for a previously proposed ylide pathway.

216 Nuc(1) yields a new tetrametaphosphate-based ylide ([Ph(3)PCHP(4)O(11)](3-), 94% yield).

217 e][I] with [Na{N(SiMe(3) )(2) }] affords the ylides [Ph(3) E=CH(2) ] (E=As, 1As; P, 1P).

218 hanism of the reactions of formyl-stabilized ylide Ph3P horizontal lineCHCHO (1) and acetyl-stabilize

219 rizontal lineCHCHO (1) and acetyl-stabilized ylide Ph3P horizontal lineCHCOMe (2) with benzhydrylium

220 roxyacetal which was added to the phosphorus ylide Ph3PCCO.

221 ttig olefination reaction with the cumulated ylide Ph3PCCO.

222 The nitrile ylide PhC(-) horizontal lineN(+) horizontal lineC(CH3)2

223 The nitrile ylide PhC(-) horizontal lineN(+) horizontal lineCH2 (30)

224 e 1,3-dipolar cycloaddition of an azomethine ylide (Prato reaction) with M(3)N@I(h)-C(80) (denoted as

225 f (18)F-FPEB was achieved by reaction of the ylide precursor (4 mg) with (18)F-Et4NF in dimethylforma

226 With the iodonium ylide precursor, (18)F-LY2459989 was prepared at high ra

227 The choice of nucleophile, azomethine ylide precursor, and dipolarophile was crucial to the su

228 method that uses a hypervalent iodonium(III) ylide precursor, to prepare the radiopharmaceutical (18)

229 use of a new trifluoromethylated azomethine ylide precursor, which leads to a series of fluorinated

230 nd glycine/alanine iminoesters as azomethine ylide precursors has been developed.

231 Radiofluorination of iodonium (III) ylides proved to be an efficient radiosynthetic strategy

232 A cyclic beta-dicarbonyl phenyliodonium ylide reacted with various substituted styrenes under Rh

233 stable toward hydrolysis and aza-phosphonium ylide reactions.

234 An oxonium ylide rearrangement formed the trisubstituted tetrahydro

235 d stereospecifically into a variety of onium ylide rearrangement products, as well as compounds that

236 Despite the importance of allylic ylide rearrangements for the synthesis of complex molecu

237 ped as a general solution to catalytic onium ylide rearrangements.

238 s that are not accessible by classical onium ylide rearrangements.

239 ig reaction, regardless of the nature of the ylide, regardless of the nature of the transition state,

240 rect formation of the corresponding carbonyl ylide resulted from the electrophilic addition of diamin

241 ar cycloaddition of unsymmetrical azomethine ylide resulting from the thermal C-C bond cleavage of un

242 derivatives and in situ generated azomethine ylide resulting in the formation of the pyrrolidine ring

243 lidene-5'-deoxy-5'-uridylaldehyde using this ylide results in a 3'-deoxy-3',4'-didehydronucleotide de

244 the azirinium ylide to metal-free azirinium ylide, ring-opening of the latter to give a 1,5-diazahex

245 the formation of a methyl triflate-based pre-ylide salt that upon treatment with base in the presence

246 t method that relies on spirocyclic iodonium ylide (SCIDY) precursors for one-step and regioselective

247 ygen atom of tetrahydrofuran to give oxonium ylide species.

248 Furthermore, a clear correlation of ee with ylide stability was observed in reactions with methyl vi

249 rimental findings reveal that the azomethine ylide stabilized by an allylic group cycloadds to [60]fu

250 and gas-phase proton affinity rival those of ylide-stabilized N-heterocyclic carbenes.

251 The corresponding ylide structure lies higher in energy, with a barrierles

252 This species, or its corresponding sulfur ylide, subsequently adds into the substrate, initiating

253 Ylide-substituted phosphines have been shown to be excel

254 to substitutions on both the alkylidene and ylide substrates and provided access to 19 new, densely

255 diofluorination via the spirocyclic iodonium ylide technology.

256 in the synthesis of this classical arsonium-ylide that have historically impeded its wider study.

257 [2,3]- and [1,2]-rearrangements of iodonium ylides that are controlled by copper catalysts bearing d

258 and convenient entry to reactive azomethine ylides that can (1) be protonated and reduced with high

259 esilylation provides endocyclic unstabilized ylides that successfully undergo cycloaddition with a ra

260 esilylation generates exocyclic unstabilized ylides that undergo cycloaddition with unsymmetrical alk

261 desilylated to give endocyclic unstabilized ylides that undergo intermolecular cycloadditions with c

262 nt Michael-addition approaches of the sulfur ylide, the transition state (TS) energies for the format

263 The resulting ylide then rearranges, using an internal carbonyl base,

264 eds through formation of a vinyl aziridinium ylide; this reactive intermediate undergoes a pseudo-[1,

265 of the metal-bound complex of the azirinium ylide to metal-free azirinium ylide, ring-opening of the

266 e intermediate, Michael-type addition of the ylide to the o-quinone methide, followed by intramolecul

267 benzylidineiminoglycinate-derived azomethine ylides to beta-silylmethylene malonates catalyzed by a A

268 ile at the nucleophilic carbon center of the ylides to give iodonium ions, which rapidly expel iodobe

269 cedure, amidine imides react with the sulfur ylides to provide imidazolines.

270 The development of a direct ylide transfer to carbonyl derivatives and of a sulfoxid

271 ted to the same conditions, both addition of ylide trapping reagents and net isomerization of cis to

272 The reaction appears to proceed through an ylide-type mechanism, where the unique strain and struct

273 an effect that is common to reactions of all ylide types strongly argues for the operation of a commo

274 erted to tailor-made alkenes with phosphorus ylides under mild conditions.

275 treating formylated BODIPYs with alkyl/aryl ylides under simple room temperature conditions.

276 Yet, the rearrangement reactions of onium ylides via gold catalyzed carbene transfer reactions are

277 h in situ generated nonstabilized azomethine ylides via the domino Mannich reaction-dipolar cycloaddi

278 the formation of a nonstabilized azomethine ylide was developed by photoinduced reaction catalyzed w

279 = p-CF(3)-C(6)H(4)) with a model sulfoxonium ylide was observed by mass spectrometry.

280 g reaction of anisaldehyde with a stabilized ylide was studied by a combination of (13)C kinetic isot

281 The resulting ester ylide was treated with hydrochloric acid to liberate the

282 have stable resonance contributions from aza-ylides were formed by using the nonhydrolysis Staudinger

283 d (in phosphonium part) phosphonium-iodonium ylides were synthesized.

284 a hydrogen acceptor, such as the phosphorus ylide, when combined with the alkylidene complex (PNP)Ti

285 dium hydroxide regenerated the corresponding ylide, which underwent a spontaneous intramolecular Witt

286 sters to generate metal-coordinated iodonium ylides, which undergo [2,3]-rearrangements with high sel

287 These conjugated ylides--which represent a subclass of mesomeric betaines

288 tions (1,3-DCs) of isatin-derived azomethine ylide with allenes have been established, which efficien

289 ect 1,3-dipolar cycloadditions of azomethine ylide with frequently used arylidene/alkylidene malonate

290 y on the [3+2]-cycloaddition of thiocarbonyl ylides with a wide variety of alkenes and alkynes.

291 pyridinium, isoquinolinium, and quinolinium ylides with acceptor substituted dipolarophiles (arylide

292 reaction of these mixed phosphonium-iodonium ylides with acetylenes opens a way to new furyl annelate

293 Treatment of beta-dicarbonyl iodonium ylides with acyl chlorides yields alpha-chloroenones wit

294 nstants k2 for the reactions of the iodonium ylides with benzhydrylium ions correlate linearly with t

295 the cross-coupling reactions of sulfoxonium ylides with C(sp(2) )-H bonds of arenes and heteroarenes

296 pyridinium, isoquinolinium, and quinolinium ylides with diarylcarbenium ions, quinone methides, and

297 e reaction of beta-dicarbonyl phenyliodonium ylides with diphenylketene at room temperature affords m

298 semistabilized, and nonstabilized phosphorus ylides with various carbonyl compounds in the presence o

299 O quantitatively (trapped as a phosphine aza-ylide) with half-lives spanning 3 orders of magnitude (m

300 heteroaryls using alpha-carbonyl sulfoxonium ylides without the help of a directing group has remaine