ライフサイエンスコーパス: sigmatropic rearrangement

1 lowed by a probable 1,3-OAc migration ([3,3]-sigmatropic rearrangement).

2 rmediate and facilitates the rate of the 3,3-sigmatropic rearrangement.

3 4 + 2) cyclohexenyl products through a [3,3]-sigmatropic rearrangement.

4 dolines via a thionium ylide-initiated [3,3]-sigmatropic rearrangement.

5 through the use of an Ireland-Claisen [3,3]-sigmatropic rearrangement.

6 a mixture of regioisomers upon heating via a sigmatropic rearrangement.

7 nverted to 3-hydroxy tetrahydropyridines via sigmatropic rearrangement.

8 luorescent indicator based on the 2-aza-Cope sigmatropic rearrangement.

9 pansion of the anionic intermediate by [1,3] sigmatropic rearrangement.

10 ate of hydrogenation relative to the rate of sigmatropic rearrangement.

11 titution via suprafacial allylic azide [3,3]-sigmatropic rearrangement.

12 e species becomes competitive with the [3,3]-sigmatropic rearrangement.

13 ilable tartrate derivative were obtained via sigmatropic rearrangement.

14 s formed immediately after the initial [3,3] sigmatropic rearrangement.

15 of oxonium ylide formation followed by [2,3]-sigmatropic rearrangement.

16 ations is combined with a diastereoselective sigmatropic rearrangement.

17 mixed acetal formation and subsequent [3,3] sigmatropic rearrangement.

18 oxonium ylide formation followed by a [2,3]-sigmatropic rearrangement.

19 described as a concerted asynchronous [3,3]-sigmatropic rearrangement.

20 les are favored over the more familiar [3,3]-sigmatropic rearrangements.

21 ry expected for classically pericyclic [3,3] sigmatropic rearrangements.

22 (+)-latifoline (1) employing a tandem [3,3] sigmatropic rearrangement/[1,2] allyl shift as a key ste

23 gold catalyzed enantioselective tandem [3,3]-sigmatropic rearrangement-[2+2]-cyclization.

24 gement (pseudopericyclic), and similar [3,3] sigmatropic rearrangements (all pericyclic), and detaile

25 featuring a Rh-mediated O-H insertion/[3,3]-sigmatropic rearrangement and subsequent alpha-ketol rea

26 nder the latter conditions resulted in [1,3]-sigmatropic rearrangement and subsequent oligomerization

27 om an unexpected and remarkably facile [1,3]-sigmatropic rearrangement, and a tactic to disfavor the

28 via a gold-catalyzed tautomerization, [3,3]-sigmatropic rearrangement, and cyclodehydration process.

29 ocyclization of the hexatriene system, [1,9]-sigmatropic rearrangement, and heterocyclic ring opening

30 s an additive increase the rate of the [3,3] sigmatropic rearrangement as well as the diastereoselect

31 as the tandem cyclization followed by [2,3]-sigmatropic rearrangement, as well as cyclization of the

32 cyclopropenation, sulfur ylide formation/2,3-sigmatropic rearrangement, as well as nitrogen ylide for

33 0(2,8)]tridec-10-ene (13TCT) undergoes [1,3] sigmatropic rearrangements at 315 degrees C in the gas p

34 The tandem ylide formation/[2,3]-sigmatropic rearrangement between donor/acceptor rhodium

35 Subsequent in situ enantioselective [2,3]-sigmatropic rearrangement catalyzed by the isothiourea b

36 lines efficiently from silver-mediated [3,3]-sigmatropic rearrangement/Diels-Alder reaction of 1,9-di

37 arrangements, as well as some typical [2, 3]-sigmatropic rearrangements, e.g., thermal rearrangements

38 nsient allenes by means of a strategic [2,3]-sigmatropic rearrangement followed by trapping of the re

39 of a stereoselective one-pot oxidative [3,3] sigmatropic rearrangement/Friedel-Crafts arylation that

40 e strategy is based on a [3,3]-allyl cyanate sigmatropic rearrangement from enantioenriched gamma-hyd

41 tero-Diels-Alder cycloadditions as well as a sigmatropic rearrangement have been located, and they al

42 [3,3]-Sigmatropic rearrangements have been widely utilized for

43 hat rapidly undergoes either [3,3]- or [5,5]-sigmatropic rearrangement in one-pot to form a 2-amino-2

44 tion pathway provides rare examples of [2,3]-sigmatropic rearrangement in this class of compounds as

45 rong experimental evidence that direct [3,5]-sigmatropic rearrangements in these molecules are favore

46 cluding [2 + 2] photocycloaddition and [3,3] sigmatropic rearrangement, indicating the possibility fo

47 isomerization process that occurs via [3,3]-sigmatropic rearrangement induced by high oxidation stat

48 roduct is formed via an intramolecular [3,3]-sigmatropic rearrangement instead of the previously prop

49 KOtBu-induced E2 elimination, undergo [3,3]-sigmatropic rearrangement/intramolecular 5-exo-dig cycli

50 Results of calculations on the [3,3] sigmatropic rearrangements involving additional transiti

51 ies on CaADH, while the exceptionally facile sigmatropic rearrangement is expected to drive computati

52 consistent with the observation that the 2,3-sigmatropic rearrangement is favored with donor/acceptor

53 A subsequent [3,3]-sigmatropic rearrangement is followed by intramolecular

54 ketyl radical-anion mechanism for the [3,3]-sigmatropic rearrangement is presented.

55 ions precedes a stereochemistry-determining sigmatropic rearrangement is reported.

56 hat the lowest energy pathway for each [3,5]-sigmatropic rearrangement is via an allowed, concerted p

57 N-Allyl enamines can undergo a [3,3] sigmatropic rearrangement known as a 3-aza-Cope (or amin

58 cond domino process, a [H]-shift and a [3,3]-sigmatropic rearrangement lead to the aromatization of t

59 e failed, we uncovered another set of tandem sigmatropic rearrangements, leading to vinyl imidate for

60 tractive and highly diastereoselective [2,3]-sigmatropic rearrangement occurs when N-methyl-1,2,3,6-t

61 talin 55 is the oxyanionic-accelerated [3,3]-sigmatropic rearrangement of 37e.

62 heir alpha-position by an asynchronous [3,3]-sigmatropic rearrangement of a mixed acetal species whic

63 ds (78-89%) in a process involving the [1,4]-sigmatropic rearrangement of a nitrile-stabilized ammoni

64 dihydroxylation, and a stereoselective [2,3]-sigmatropic rearrangement of a selenoxide to effect a 1,

65 wn to be an effective catalyst for the [3,3]-sigmatropic rearrangement of a variety of substituted al

66 NEPHOS(AuCl)(2)), has been developed for the sigmatropic rearrangement of alkenyl-methylenecyclopropa

67 ve mechanisms of the gold(I)-catalyzed [3,3] sigmatropic rearrangement of allenyl vinyl ethers by den

68 development of an efficient oxidative [2,3]-sigmatropic rearrangement of allylic hydrazides, via sin

69 The [2,3]-sigmatropic rearrangement of allylic sulfoxides to allyl

70 Under certain conditions, the [2,3]-sigmatropic rearrangement of allyloxy carbonyl compounds

71 se of phase-transfer catalysis for the [2,3]-sigmatropic rearrangement of allyloxy carbonyl compounds

72 (II)-catalyzed oxonium ylide formation-[2,3] sigmatropic rearrangement of alpha-diazo-beta-ketoesters

73 abicyclo[5.3.0]decane ring system by a [3,3] sigmatropic rearrangement of an acylimmonium ion followe

74 conocene-promoted ring contraction and [3,3] sigmatropic rearrangement of an enynol.

75 eveloped via a dichlorocarbene insertion and sigmatropic rearrangement of an in situ generated ylide.

76 We find the barrier for sigmatropic rearrangement of chemisorbed hydrogen atoms

77 ence for a mechanism that involves the [3,3] sigmatropic rearrangement of divinylcyclopropanes.

78 he scope of the NCS-mediated amination/[2,3]-sigmatropic rearrangement of enantioenriched allylic sel

79 ed to the allylic amines via Overman's [3,3]-sigmatropic rearrangement of imidates.

80 systems are prepared by acid-catalyzed [3,3]-sigmatropic rearrangement of O-aryloximes.

81 nsformed directly to allenes through a [2,3]-sigmatropic rearrangement of propargyl phosphites.

82 mparative study of the Au(I)-catalyzed [3,3]-sigmatropic rearrangement of propargylic esters and prop

83 Sigmatropic rearrangement of spirocyclic pyrazoles to fu

84 er-catalyzed generation and subsequent [2,3]-sigmatropic rearrangement of sulfur ylides is strongly d

85 Products are obtained by [3,3]-sigmatropic rearrangement of the azasulfonium enolate or

86 Instead, a [3,3]-sigmatropic rearrangement of the initial cyclization int

87 ith the N-Boc-oxaziridine 1 results in [2,3]-sigmatropic rearrangement of the intermediate allylic N-

88 Quantum chemical calculations of a [3,3]sigmatropic rearrangement of the N,O-divinyl hydroxylami

89 rs at the terminal oxygen, followed by [2,3]-sigmatropic rearrangement of the pendant allyl group, in

90 The mechanism involves a [2,3]-sigmatropic rearrangement of the respective selenoxides

91 bsolute stereochemistry and (ii) a new [3,3]-sigmatropic rearrangement of the thiono-Claisen variety

92 Earlier studies have shown that [3,3]-sigmatropic rearrangements of allyl esters are useful fo

93 The [2,3]- and [1,2]-sigmatropic rearrangements of ammonium ylides are studie

94 [2,3]-Sigmatropic rearrangements of beta-unsaturated sulfinyl

95 l computational study of the concerted [3,3] sigmatropic rearrangements of cis-1-iminyl-2-ketenylcycl

96 ta- and delta-eliminations, as well as [3,3]-sigmatropic rearrangements of esters are primarily pseud

97 rroles has been achieved via [3,3] and [1,3] sigmatropic rearrangements of O-vinyl oximes, respective

98 relative rate constants for ring opening and sigmatropic rearrangements of the dihydrophenanthrene in

99 rhodium-bound oxonium ylide formation, [2,3]-sigmatropic rearrangement, oxy-Cope rearrangement, enol-

100 The 2,3-sigmatropic rearrangement proceeds through initial cleav

101 reochemically unscathed by competitive [3,3]-sigmatropic rearrangement processes.

102 C gives a modest yield of the initial [3,5]-sigmatropic rearrangement product, 2,6-diacetoxy-6-methy

103 refore affords the radical anion without any sigmatropic rearrangement products.

104 he semiquinone which is rapidly converted to sigmatropic rearrangement products.

105 essentially pericyclic), the 11 --> 12 [3,3] sigmatropic rearrangement (pseudopericyclic), and simila

106 The first example of a biocatalytic [2,3]-sigmatropic rearrangement reaction involving allylic sul

107 s-alkenes is evidenced by their formal [1,3]-sigmatropic rearrangement reactions and the rapid additi

108 s via stereocontrolled cyanate-to-isocyanate sigmatropic rearrangement reactions of the corresponding

109 rgo thermal and photolytic cycloaddition/1,5-sigmatropic rearrangement reactions with 11a-d with N(2)

110 engineered to initiate a sulfimidation/[2,3]-sigmatropic rearrangement sequence in whole E. coli cell

111 rignard ring opening/allylic sulfoxide [2,3]-sigmatropic rearrangement sequence previously developed

112 f kinetic resolution, and the stereospecific sigmatropic rearrangement step, which proceeds with full

113 of dynamic trajectories in [1,2]- and [2,3]-sigmatropic rearrangements suggests a counterintuitive a

114 on to N-fused pyrroles proceeded via a [3,3]-sigmatropic rearrangement, the analogous cycloisomerizat

115 cyclo[4.2.0]oct-2-ene (1a) undergoes a [1,3] sigmatropic rearrangement to 5-exo- and 5-endo-methoxybi

116 cyclo[4.2.0]oct-2-ene (1a) undergoes a [1,3] sigmatropic rearrangement to 5-methylbicyclo[2.2.2]oct-2

117 binaphthyl hydrazines undergo a facile [3,3]-sigmatropic rearrangement to afford enantiomerically enr

118 The route relies on the aza-[2,3]-Wittig sigmatropic rearrangement to efficiently install the rel

119 incipally via SO2-N bond homolysis and [1,5] sigmatropic rearrangement to generate 37, 10 proceeded v

120 ive trans-1,3-pentadiene, 40 +/- 3% of [3,3]-sigmatropic rearrangement to give cis-3-penten-2-yl acet

121 give cis-1,3-pentadiene, 32 +/- 2% of [3,3]-sigmatropic rearrangement to give trans-3-penten-2-yl ac

122 lled stereoselective Mislow-Evans-type [2,3]-sigmatropic rearrangement to install the C5 stereocenter

123 cycloaddition participate in a thermal [3,3] sigmatropic rearrangement to yield bicyclo[3.3.2]decadie

124 The most favored [3,3]-sigmatropic rearrangement transition state is bimodal, l

125 Several [3,3] sigmatropic rearrangement transition states were also lo

126 ged 16-acetate (2), which can form from 1 by sigmatropic rearrangement under basic conditions, batrac

127 sors are readily prepared and undergo smooth sigmatropic rearrangement upon exposure to iodosobenzene

128 The carbene undergoes two [1,2]-sigmatropic rearrangements via competing 1,2-C atom shif

129 Here, using a series of sequential [3,3]-sigmatropic rearrangements, we report the total synthesi

130 Three sigmatropic rearrangements were employed in building the

131 esting and unexpected [1,2]-Wittig and [1,3]-sigmatropic rearrangements were identified during the op

132 The disfavored [3,3]-sigmatropic rearrangement, which would produce the unobs

133 rmed through the use of a Still-Wittig [2,3]-sigmatropic rearrangement, while the trans mimic, the (E

134 Sigmatropic rearrangements, while rare in biology, offer

135 n demonstrated by combining the Mislow [2,3]-sigmatropic rearrangement with catalytic asymmetric hydr

136 These systems undergo the [3,3] sigmatropic rearrangement with high selectivity, with a

137 no-Claisen variety that is among the fastest sigmatropic rearrangements yet reported.