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1 rmation occurs through a 4pi-electron-5-atom electrocyclization.
2 med from 2 via a photochemical four-electron electrocyclization.
3 ed nitrogen insertion and excited-state-4pai electrocyclization.
4 lectivity toward a putative 6pai-disrotatory electrocyclization.
5 favoring the [1,5]H-shift reaction over 6pi-electrocyclization.
6 s, and this undergoes a cationic conrotatory electrocyclization.
7 tion, followed by a thermal, conrotatory 4pi-electrocyclization.
8 nd the high torquoselectivity of the key 6pi electrocyclization.
9 polyketide substrate to direct its efficient electrocyclization.
10 nyl-1,2,3-triazoles featuring an unusual 4pi electrocyclization.
11 sults in the emergence of a chromene upon an electrocyclization.
12 ion of cyanoolefins to 1-4 followed by retro-electrocyclization.
13 ia Wittig reaction followed by photochemical electrocyclization.
14 re may guide developing other boron-mediated electrocyclizations.
15 lopment of new catalysts for stereoselective electrocyclizations.
16 two distinct reaction channels, namely, 6pi-electrocyclization (2 --> 3) and [1,5]H-sigmatropic shif
17 ion, followed by an unusual low-barrier 6pai-electrocyclization accelerated by the BN/CC isomerism.
18 8pai electrocyclizations followed by a 6pai electrocyclization and a cycloaddition are relatively co
19 that includes a stereospecific halo-Nazarov electrocyclization and a diastereoselective Friedel-Craf
20 hrough tandem 1,6-Michael-type addition-6pai electrocyclization and an in situ oxidation sequence.
22 renium ions and their rearrangement via 4pai electrocyclization and following "1,2-methylene shift".
23 s of reactivity and selectivity, both in the electrocyclization and in the subsequent transformations
24 rted the idea that the cyclization is a 4pai-electrocyclization and not a 5-endo-dig ring closure as
25 ble derivatives, a one pot C-H alkenylation, electrocyclization and reduction provides the tetrahydro
26 of styryl carbonyl ylide which undergoes 1,7-electrocyclization and subsequent 1,5-hydrogen shift.
27 d C-H activation-alkyne coupling followed by electrocyclization and subsequent acid/borohydride-promo
32 ctivator to setup tandem Michael addition-6n-electrocyclization, and its eventual sacrificial elimina
34 hieved on a gram scale, based on an aza-6pai electrocyclization-aromatization strategy for constructi
35 e exploited to forge the carbazole core: 6pi-electrocyclization/aromatization and indole C2-H bond ac
37 construct the trans-decalin ring, and a 6pi-electrocyclization/aromatization sequence to produce the
38 the corresponding precursors followed by 6pi-electrocyclization/aromatization, while isomeric TD-syn-
39 The third novel pathway relies upon 8pai-electrocyclization as the key step of this reaction; int
41 matic aldehydes through tandem addition/4pai-electrocyclization/benzylation via tetrahydroindeno-oxep
43 yclic scaffolds are prepared in an 8pai/6pai electrocyclization cascade of a stereodefined pentaene,
44 olecular CH alkenylation/torquoselective 6pi electrocyclization cascade provides a fused bicyclic 1,2
45 precedented thermally induced 8pai/6pai/4pai electrocyclization cascade sequence to produce trisubsti
46 proceeds through a [1,5]-hydride shift/6pai-electrocyclization cascade, followed by a thiirane extru
47 evenagel condensation and carbonyl-selective electrocyclization cascade, which was followed by a dire
50 ams to propose that the stereoselectivity of electrocyclizations could be explained by the correlatio
51 -quinone methide (o-QM) intermediate through electrocyclization, cycloisomerization, or conjugate add
52 rhodium catalyzed C-H bond functionalization/electrocyclization/dehydration procedure has been develo
55 raenes undergo facile but less exergonic 8pi electrocyclization due to a steric clash that destabiliz
56 ode of ring closure is favored for these 6pi electrocyclizations due to a steric interaction that des
57 s similar ones of ours involving the 3 --> 4 electrocyclization (essentially pericyclic), the 11 -->
60 ee steps of the sequence are stereospecific: electrocyclization followed by two [1,2]-suprafacial Wag
62 further key transformation involves thermal electrocyclization, followed by MnO(2)-mediated dehydrog
63 and iodine-mediated oxidative photochemical electrocyclization for construction of the ABCD ring moi
65 leads to its photochemical isomerization and electrocyclization, giving rise to different byproducts.
66 ted to substituted chromanes by thermal 6pai-electrocyclization in HMPA followed by in situ aromatiza
67 carbazole derivatives were produced via 6pai electrocyclization in the case of methoxy (-OMe)-substit
68 zation in the former moiety and photochromic electrocyclization in the latter, this dithienylbenzene
69 nce is presented for both retro-4pi and -6pi electrocyclization in these systems, lending support to
70 ocyclic ring opening-proton transfer and 6pi electrocyclization, in which a variety of functional gro
72 The skeletal photorearrangement including 6n-electrocyclization induced by UV light of ortho-halogen-
73 sting discoveries from this work is that the electrocyclization intermediate can be competitively cap
74 idin-6(7H)-ones, which are formed via a 6pai electrocyclization involving the vicinal aryl or hetaryl
75 the C-N regiospecificity of the photoinduced electrocyclization is a general feature of ortho-styryl-
76 m chemical analysis, we demonstrate that the electrocyclization is driven jointly and synergistically
77 n using HCl in dioxane, the 4pai-conrotatory electrocyclization is more favorable, whereas GaCl(3) in
80 6pi electrocyclization step of these cascade electrocyclizations is also potentially diastereoselecti
82 sional effects, but for highly exo selective electrocyclizations, it is reinforced by a second effect
83 Z-alkene isomerization, a 6pai photochemical electrocyclization (Mallory photocyclization); the new b
84 ly substituted carbazole via a retro-4pi/6pi-electrocyclization-N-acylation cascade reaction to provi
85 rization and irreversible intramolecular 6pi electrocyclization of 1,3-cis,5-hexatriene sequences fol
86 ction that proceeds via pseudopericyclic 1,5-electrocyclization of 2-azabutadiene into 7aH-indolium y
87 pyrrolines most likely proceeds via the 6pai electrocyclization of a conjugated NH-azomethine ylide.
89 n technique to explore the ground state 6pai electrocyclization of a dithienylethene (DTE) derivative
91 fied a reaction mechanism that features a 6n-electrocyclization of a sulfilimine intermediate followe
93 pf et al. reported the high-temperature 6pai-electrocyclization of cis-hexa-1,3-diene-5-yne to benzen
96 a benzene motif influences the photoinduced electrocyclization of dithienylethenes, a major class of
97 mino reaction sequence entailing the Nazarov electrocyclization of divinyl ketones and nucleophilic a
99 azoles via a tandem catalytic cross-coupling/electrocyclization of enol triflates and diazoacetates i
100 6) as a precatalyst for the disrotatory 6pai electrocyclization of highly substituted trienes that ar
101 ptenes, and the latter are formed via a 6pai-electrocyclization of intermediate cycloheptadienyl anio
103 using a high-pressure promoted Nazarov-like electrocyclization of Stenhouse salts arising from the S
104 zole derivatives through the iodine-promoted electrocyclization of substituted indoles and 4-aryliden
105 are based on nucleophilic addition and 4pai-electrocyclization of the azomethine ylide, and our resu
109 turated ketoxime O-pentafluorobenzoates, (2) electrocyclization of the resulting 3-azatriene, and (3)
110 -Lam coupling and subsequent spontaneous 6pi electrocyclization of these intermediates for the synthe
111 n of this hydrocarbon, such that conrotatory electrocyclization of vinylogous sesquifulvalene behaves
112 e none!" Prinzbach reported in 1978 that the electrocyclization of vinylogous sesquifulvalene occurs
115 space (CAS) molecular orbitals (MOs) for the electrocyclizations of 3, 5, 7, 9, and 10 suggest that i
116 l. have reported a series of torquoselective electrocyclizations of chiral 1-azahexa-1E,3Z,5E-trienes
117 ted, as well as parallel calculations on the electrocyclizations of hepta-1,2,4,6-tetraene 5, hexa-1,
119 ions of the fundamental Bergman cyclization: electrocyclizations of the penta-1,4-diyne anion, hepta-
120 orm 1,3,5-cyclooctatrienes; however, the 6pi electrocyclizations of these cyclooctatriene intermediat
121 xpected products of ketimine formation, 6pai electrocyclization, or quinoline formation were least/no
122 cific live-cell imaging probe based on a 6pi electrocyclization/oxidation mechanism is described.
123 An extension of the tandem coupling/4pi-electrocyclization pathway was demonstrated by a palladi
125 nded to realize aryl vinyl oxetane as a 4pai-electrocyclization precursor to access indene ethanol.
126 nism involving a concerted 1,4-hydride shift/electrocyclization process as the rate-determining step
127 rans-diastereoisomers via a 4pai-conrotatory electrocyclization process elucidating the key step in t
129 f dienyl carboxylic acids followed by a 6pai-electrocyclization process to form substituted 2-pyridon
131 ing followed by a ring flip and a subsequent electrocyclization proposed by Nicolaou, was computation
133 ood yields by the [2 + 2]cycloaddition-retro-electrocyclization reaction of 4-methylideneisoxazol-5(4
134 Thus, we introduce a novel mechanism for the electrocyclization reaction of conjugated azomethine yli
135 opic behavior and on the photoinduced [6pai]-electrocyclization reaction of substituted triphenylamin
137 ns include phenyl boronic acid-mediated 6pai-electrocyclization reaction, a stereospecific hydrogenat
138 ction condition followed by a conrotatory 4n-electrocyclization reaction, which takes care of the exc
140 nducted in order to assess the efficiency of electrocyclization reactions of keteniminium salts, in a
141 ntene derivatives were produced through 4pai electrocyclization reactions with indole, 7-methylindole
143 he zwitterionic MOFs in three representative electrocyclization reactions: [2 + 1] cycloisomerization
148 include one based on a novel aza-Wittig-6pi-electrocyclization sequence and others based on ring-clo
151 heavy-atom tunneling contributes 21% to the electrocyclization step leading to (+)-occidentalol (3),
155 it impacts the DHIs' optical properties and electrocyclization (switching) rates to the spiro confor
156 ropanes, and (3) undergo a Nazarov-like 6-pi electrocyclization that upon reduction give 2-azabicyclo
157 n with extensive analyses and comparisons to electrocyclizations that obey the Woodward-Hoffmann rule
158 erwent several chemical processes, including electrocyclization, the aza-Diels-Alder reaction, and th
159 of the tetramic acid PF-1018 through an 8pai electrocyclization, the product of which is immediately
161 deauration step promotes ring closure by 1,7-electrocyclization through an intramolecular Pictet-Spen
162 ctadienyl anions readily undergo disrotatory electrocyclization to cis-bicyclo[3.3.0]octenyl systems,
163 features a cascade process involving a 6pai electrocyclization to construct the indane core of delav
164 diates with acyl electrophiles triggers 6pai electrocyclization to extrude the nitrogen atom and rest
165 n heating, nitrodienes rearrange through 6pi-electrocyclization to form nitronate intermediates, whic
168 o experience intramolecular [1,5]- and [1,3]-electrocyclizations to produce reactive cyclopropenes an
170 , and only in one of the allowed disrotatory electrocyclization transition states is the ideal stereo
171 ntrols the conformational preferences at the electrocyclization transition states, and only in one of
175 The intermediate cations undergo facile 4pi-electrocyclization under ambient condition to give diver
176 t the stereodetermining step involves a 6pai electrocyclization under both thermal and photoredox con
178 3-benzoxazines via an unprecedented oxa-6pai electrocyclization utilizing racemic alpha-substituted g
181 sting cascade sequence involving facile 6 pi electrocyclizations which leads to complex benzopyran sy
183 termediacy of indolidene intermediates whose electrocyclizations (with or without copper present) def