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1 ring closure) leading to the dihydrodipyrrin-acetal.
2 carbenoid complex, generated from propargyl acetal.
3 e bonds such as geminal diol, disulfide, and acetal.
4 ubstituted (propanoate-derived) silyl ketene acetal.
5 ondensation of the resulting dihydrodipyrrin-acetal.
6 omatics, silyl enol ethers, and silyl ketene acetals.
7 with ethoxymethyl chloride and formaldehyde acetals.
8 s-oxycyclization to afford tricyclic bridged acetals.
9 stabilization of the resulting N,N- and O,N-acetals.
10 ions of phenol-derived Rychnovsky-type mixed acetals.
11 tivation pathway of five-membered semicyclic acetals.
12 ate between aldehydes and thiopyridyl ketene acetals.
13 ves from indoles and nitrogen-functionalized acetals.
14 on of terminal alkynes to racemic isochroman acetals.
15 y cyclize divinyl ethers to analogous cyclic acetals.
16 itions to form highly functionalized nitroso acetals.
17 and amines, alkenes, unsaturated esters, and acetals.
18 e transition state during the degradation of acetals.
19 size of the substituents on the silyl ketene acetals.
20 recedented migration-fragmentation of ketals/acetals.
21 Z- and E-enamides, an amide, and N,O-ketene acetals.
22 is of tosylates but not in the hydrolysis of acetals.
23 been applied to the synthesis of chiral N,N-acetals.
24 stereodivergent resolution to diastereomeric acetals.
25 pper-catalyzed alkynylations of benzopyranyl acetals.
26 luoromethylphenyl)sulfonyl-substituted alkyl acetals.
29 -stabilized oxocarbenium ions generated from acetals 14a-e or 15a-e is controlled by the stereoelectr
33 ifunctional ligand with an attached pyruvate acetal, a ligand for human amyloid P component, and conj
35 ldehydes, esters, heterocycles, silyl ketene acetals, alcohols) is then discussed in the context of m
36 ve deprotection of the resulting benzylidene acetal allowed for swift access to the delta-lactone.
37 e (DDQ) with silyl enol ethers, silyl ketene acetals, allylsilanes, enamino esters, and diazomethanes
38 ng for the first time a sterically demanding acetal, an intramolecular chemoselective acylation to ac
39 rst-order kinetic dependence on silyl ketene acetal and 1-naphthaldehyde and a zeroth-order dependenc
41 to-dioxinone with dimethylformamide dimethyl acetal and a range of magnesium acetylides gave the corr
42 nges on a Hosomi-Sakurai coupling of complex acetal and allylsilane coupling partners, followed by DD
43 of an aldol-like coupling between a dimethyl acetal and an N-acetylthiazolidinethione for the direct,
44 yields for formation of the dihydrodipyrrin-acetal and bacteriochlorin underpins evaluation of synth
47 Protection of the hydroxy group as a THP acetal and oxidative cleavage of the C,C-double bond pro
48 other CH(2)O molecules and the formation of acetal and polyacetal intermediates, which inhibits the
49 of an aldehyde with a trimethylsilyl ketene acetal and the oxazaborolidinone prepared from N-Ts-(S)-
53 step from easily accessible phenylpropargyl acetals and benzaldimine substrates in the presence of a
54 er acidic conditions typical for hydrolyzing acetals and constitute orthogonal protecting groups with
55 methyldinocap), in 2009, BTH increased total acetals and esters, while CHT raised the levels of total
56 tection of carbonyls and the deprotection of acetals and ketals involve the participation of a water
57 ticipation of a water molecule: formation of acetals and ketals is a dehydration process, whereas the
58 presented by the TFA-mediated conversion of acetals and ketals to carbonyls has never been previousl
60 ky silanes results in formation of bis(silyl)acetals and methyl silyl ethers as well as siloxanes and
61 disubstituted silyl synthons to afford silyl acetals and Rh-catalyzed ortho-C-H silylation to provide
62 e of kinetically reversible adducts, such as acetals and sulfonates, so that sample preparation steps
64 when calculated energies of hemiaminals (N,O-acetals) and aminals (N,N-acetals) were compared with ex
66 propargyl alcohol, bromoacetaldehyde diethyl acetal, and OEGs or PEGs was developed as a convenient p
67 would be possible with an oxopyridyl ketene acetal, and this was confirmed experimentally, leading t
69 h C-nucleophiles (enamines, silylated ketene acetals, and enol ethers) have been determined photometr
72 eta,gamma-unsaturated CH(2)=CHCH(2)CH(OR)(2) acetals, and they cyclize divinyl ethers to analogous cy
74 ction of 1 followed by an intramolecular N,O-acetal- and N,N-aminal formation, respectively, which pr
76 .2.2]octadiene-type products and benzoxepine acetals are formed in this reaction, in ratios and yield
84 ] for self-condensation of a dihydrodipyrrin-acetal (bearing a geminal dimethyl group in the pyrrolin
88 acceleration of ionization in more flexible acetals can be up to 200-fold when compensated for induc
91 the formation of a less reactive full cyclic acetal catalyzed by the acidity of the DNPH solution and
92 spiroketal subunit, the configuration at the acetal center in both structures is unchanged and is con
93 tals with high S(N)2-like selectivity at the acetal center in the presence of Me2BBr and thiophenol.
95 r content of furans, aldehydes, ketones, and acetals, compared with unpressurised wines after 9 month
96 (N-S) self-condensation of a dihydrodipyrrin-acetal complements a prior Eastern-Western (E-W) route.
101 , a thermally promoted methylenecyclopropane acetal cycloaddition, and a Pd-catalyzed cycloaddition o
107 , whereas the tert-butyldimethylsilyl ketene acetals derived from bulky esters of alpha-methoxyacetic
109 rs included triethylsilyldiperoxyketals and -acetals derived from geminal dihydroperoxides and from a
113 ble materials, features a diastereoselective acetal-directed cyclopropanation of an electron-deficien
115 nucleophilic addition to silicon removes the acetal directing groups and directly provides unmasked p
116 equivalents, which allow not only removal of acetal directing groups but also introduce useful functi
117 ion metal catalysts and the use of traceless acetal directing groups, has been employed to provide fa
118 species and an alpha,beta-unsaturated ketone-acetal (e.g., 1,1-dimethoxy-4-methylpent-3-en-2-one).
119 pyrrolic substituents in the dihydrodipyrrin-acetal (electron-withdrawing, electron-donating, or no s
120 are highly dependent upon the type of ketene acetal employed but independent of ketene acetal geometr
121 building blocks of organic synthesis such as acetals, enolates, Michael acceptors, acylating reagents
123 groups of aromatic compounds in high yields acetals, ethanol and ethyl aromatics, and methyl aromati
124 coupling conditions such as esters, ketones, acetals, ethers, silyl ethers, and dimethylamino groups.
126 with 2-naphthols in preference to the mixed acetal formation and subsequent [3,3] sigmatropic rearra
127 eoselective oxy-Michael addition/benzylidene acetal formation coupled with a selective axial oxocarbe
128 onstrate that O-substitution by (glycosylic) acetal formation greatly increased the chemical stabilit
129 ethylsilyl ester formation, bis-silyl ketene acetal formation, and TMSOTf-catalyzed Mukaiyama aldol a
133 d in the context of preparing polycyclic N,O-acetals from simple 1-(aminomethyl)-beta-naphthols and 2
134 f the remaining 2'-[4-(N-methylamino)benzyl] acetals from the RNA oligonucleotide was effected in buf
138 plasmenyl cyclophosphatidic acid and a mixed acetal glycolipid, with the latter subsequently being is
139 1,2-diol moiety masked as an isopropylidene acetal group and long alkyl chains comprised of 12 and 1
140 e where the alkoxy group was tethered to the acetal group by a five-membered ring compared to one whe
141 nogated ensemble has been developed by using acetal group linked gold nanoparticle capped mesoporous
142 wo parts: radical, anionic, and silyl ketene acetal group transfer polymerization (SKA-GTP) of vinylp
144 The physical and chemical behavior of these acetal groups can be adjusted by modifying their stereoe
147 y R3SiH to afford sequentially the bis(silyl)acetal, H2C(OSiR3)2, and CH4 (R3SiH = PhSiH3, Et3SiH, an
148 ng reaction of quinoline-derived allylic N,O-acetals has been studied using a combination of structur
149 ic acid-catalyzed cyclization of unsaturated acetals has been utilized for the synthesis of functiona
152 as for the HCl-promoted synthesis of 2-amino acetal hydrochlorides and alpha-amino ketone and alpha-a
155 indicate that an alkoxy group can accelerate acetal hydrolysis by up to 20-fold compared to substrate
159 tion-controlled reducing reagent for acyclic acetal (i.e., MOM, MEM, SEM, and BOM) protected alpha-hy
160 r formed from the in situ generated dimethyl acetal in the presence of triflic acid undergoes alkylat
163 eactions of propargyl acetates and propargyl acetals in the chiral ligand-controlled Rautenstrauch re
164 and thioesters add in high yield to dimethyl acetals in the presence of silyl trifluoromethanesulfona
166 rates, experiments with 4-alkoxy-substituted acetals indicate that an alkoxy group can accelerate ace
167 ves initial hydroxylation of substrate to an acetal intermediate and its subsequent attack onto an Fe
169 r the conversion of a late-stage benzylidene acetal into a primary alcohol and a secondary benzoate e
170 od is suitable for a direct isomerization of acetals into the thermodynamically preferred isomer as l
172 rho value for the hydrolysis of benzylidene acetals is about -4.06, which is comparable to an SN1-li
175 other hydrolyzable bonds, such as anhydride, acetal, ketal, or imine, in their backbone structures.
176 between allyl or allenyl boronic esters and acetals, ketals, or aminals have proceeded in high yield
177 ported for catalytic alkynylation of acyclic acetals/ketals, and is uniquely enabled by the applicati
180 ymmetrical monomethylated cyclic unsaturated acetal leads to hyperolactone C, where ylide formation-r
181 gs linked to the desosamine glycoside via an acetal linkage (referred to as "carbolides") in a regios
185 ment of water-soluble siRNA carriers, namely acetal-linked amino-dextrans, with various amine structu
189 rinotecan, in the compartment containing the acetal-modified dextran polymer and the pH dependent rel
190 partment containing a pH responsive polymer, acetal-modified dextran, and PLGA (polylactide-co-glycol
191 ccharide, was modified at its hydroxyls with acetal moieties such that it became insoluble in water b
192 ntaining the peroxide, monoperoxyacetal, and acetal moieties was developed based on the acid-catalyze
193 e of baumycins is the presence of an unusual acetal moiety appended to daunosamine, which is hydrolyz
195 her backbone in lieu of the (isopropylidene) acetal moiety characteristic for traditional TADDOL's.
196 embedded within the bicyclo[5.2.1]decane-N,O-acetal moiety of sieboldine A was a formidable challenge
198 ional groups such as esters, amides, ethers, acetals, nitriles, and tertiary amines and, therefore, s
199 to the steric bias engendered by the mesityl acetal of 87 and contact ion pairing of the intermediate
200 aldol addition of the tert-butylsilyl ketene acetal of tert-butyl propanoate with 1-naphthaldehyde is
201 ctionalized alkylimines with the silylketene acetal of the above lactone, whereas 2,3-cis-morpholines
202 sis includes three-component condensation of acetals of 2-azidoaldehydes with urea or methylurea and
203 ing revealed, however, that products are the acetals of the unsaturated reagent rather than the desir
208 cs of polymeric nanogels that contains these acetal or ketal moieties as cross-linking functionalitie
209 ctive reduction of CO2 into either bis(boryl)acetal or methoxyborane depending on the hydroborane use
210 ive difluoro or monofluoroacetyl-substituted acetals or corresponding difluoromethylphosphonate- and
211 aneous hydrolysis conditions, the alkylidene acetal, or its 7-carba analog, retards hydrolysis with r
213 alkylation, installation of the methylidene acetal, palladium-catalyzed O-arylation, and C3,C3'-deca
215 ation between ZnCl(2) and thiopyridyl ketene acetals prior to aldehyde addition for optimal reaction
217 addition, the highly functionalized nitroso acetal products can be hydrogenolyzed selectively to for
218 Novel bis- and tetraepoxides and bicyclic acetal products, arising from rearrangements of anthrace
222 reaction of aldehydes and thiopyridyl ketene acetals provides a versatile, highly diastereoselective
223 ehydes, including those generated from their acetals, provides reversible 2'-O-protected ribonucleosi
224 n ketone-derived hydrazones and silyl ketene acetals, providing the beta,beta-disubstituted beta-amin
227 2- versus 3-position in the dihydrodipyrrin-acetals, respectively, (2) the method of synthesis of th
228 ns of C-4 sulfur-substituted tetrahydropyran acetals revealed that neighboring-group participation do
229 d by regioselective reductive opening of the acetal ring in the parent 4(I),6(I)-O-benzylidene deriva
231 nt, (c) fragmentation of the O-C bond in the acetal ring, or (d) fragmentation with elimination of th
232 rgman cyclization in enediynes equipped with acetal rings mimicking the carbohydrate moiety of natura
233 C1' to C4' cyclization where the OTMS of the acetal serves as the nucleophile to generate 2'-oxynucle
234 amine moieties and structural composition of acetals showed high in vitro transfection efficiency and
235 ntial amounts of a hemicarcerand lacking one acetal spanner suggests that (3)PN decays preferentially
236 s [3,3]-sigmatropic rearrangement of a mixed acetal species which is formed in situ under the reactio
237 of [2.2]para-cyclophanes with cyclic ketene acetals, specifically 5,6-benzo-2-methylene-1,3-dioxepan
238 oduct pH, to induce hemiacetal formation and acetal stabilization or induce and stabilize carbonyl sp
239 ositol orthoformate to the corresponding 1,3-acetal, stereospecific introduction of the amino group v
240 toesters possessing gamma-cyclic unsaturated acetal substitution, followed by acid-catalyzed eliminat
244 the alkoxy protecting group (OMe, OPMB, PMP acetal, tetrahydropyran, and OTBS) present in the boron
245 covery and the subsequent rational design of acetals that serve as chiral auxiliaries on the allene i
247 lective allylation reactions of silyl ketene acetals, the silicon enolates of esters, to form product
248 alpha-Oxy radicals generated from benzylic acetals, TMSCl, and a mild reductant can participate in
249 onamide employing dimethylformamide dimethyl acetal to afford an enaminone that can react intramolecu
250 aled that the TFA-mediated transformation of acetal to aldehyde occurs via a hemiacetal TFA ester int
251 tage of the ability of the 4,6-O-benzylidene acetal to control the stereochemistry of the beta-D-glyc
252 ated oxidative cyclization of a silyl ketene acetal to generate an all-carbon quaternary center and b
253 reaction between tropones and ketene diethyl acetal to give bicyclo[3.2.2] ring structures, which ope
254 noside unit and of a 2,3-O-diphenylmethylene acetal to install the alpha-L-rhamnopyranosidic linkages
255 inetics are dependent on the ratio of ketene acetals to [2.2]para-cyclophanes as well as the hydropho
257 y available, racemic isochroman and chromene acetals to deliver alpha-chiral oxygen heterocycles.
258 l functionalities, and (3) using other amide acetals to expand the substitution patterns of pyridines
259 nyldiazo carbonyl species react with organic acetals to give E-configured alkyl 3,5-dimethoxy-5-pent-
261 ty functional theory calculations on nitroso acetal-to-aminal rearrangements reported by Denmark and
262 aponins with dioxolane-type (2 saponins) and acetal-type (16 saponins) substituents were detected in
264 lyl ether to alpha,beta-unsaturated aldehyde acetals under Lewis acidic conditions proceeds with good
266 pha-position of pyrrole ring A and the alpha-acetal unit attached to pyrroline ring B forms the bacte
267 he gem-dimethyl group (with respect to the 1-acetal unit) at the 2- versus 3-position in the dihydrod
268 This reaction takes place via in situ formed acetal using triflic acid and trimethyl orthoformate.
269 serve as substitutes of acrolein or acrolein acetals, utilisation of which has already led to interes
270 chlorin substituents via the dihydrodipyrrin-acetal versus late installation via derivatization of be
271 azides), and N,N-dialkyloxyformamide dialkyl acetal via electrophilic addition of immonium ion to cop
272 stent with the relative degradation rates of acetals vs ketals (correlated to stabilities of 1 degree
273 p procedure, the in situ generated bis(boryl)acetal was shown to be a reactive and versatile source o
276 -accelerated alkylation of dialkylstannylene acetals was studied at several levels of theory in the g
280 f hemiaminals (N,O-acetals) and aminals (N,N-acetals) were compared with experimental equilibrium con
281 les 8(a-j) (silylated enol ethers and ketene acetals) were studied kinetically using photometric moni
283 generating silyl enol ether or silyl ketene acetal, which are key intermediates in the reaction.
284 tails self-condensation of a dihydrodipyrrin-acetal, which in turn is prepared from a 2-(2-nitroethyl
285 ng the formation of a mixed chiral phosphate acetal, which undergoes a concerted, asynchronous S(N)2'
287 dergo elimination, allowing the isolation of acetals, which subsequently can be hydrolyzed to their c
288 whereas substitution of the 4,6-benzylidene acetal with a 4,6-di-tert-butyl silylidene led to a slig
290 ctions of n-hexyl-substituted cyclopropanone acetals with alkyl azides, a mixture of 2-azetidinones a
293 e the Ni-catalysed Csp(3) Suzuki coupling of acetals with boronic acids to generate benzylic ethers,
295 asymmetric Mannich reaction of silyl ketene acetals with N-Boc-amino sulfones has been developed.
297 stereoselectivities in the substitutions of acetals with strong nucleophiles depended on reaction co
298 promoted coupling of stable, easily prepared acetals with widely available potassium aryl-, alkenyl-,
299 om previously unreported C-alkynyl N-Boc-N,O-acetals, with alpha-substituted beta-keto esters and les
300 limited ionization ability, principally N,O-acetals, without the use of an exogenous reagent have be
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