ライフサイエンスコーパス: electrocyclization

1 favoring the [1,5]H-shift reaction over 6pi-electrocyclization.

2 s, and this undergoes a cationic conrotatory electrocyclization.

3 tion, followed by a thermal, conrotatory 4pi-electrocyclization.

4 nd the high torquoselectivity of the key 6pi electrocyclization.

5 polyketide substrate to direct its efficient electrocyclization.

6 nyl-1,2,3-triazoles featuring an unusual 4pi electrocyclization.

7 sults in the emergence of a chromene upon an electrocyclization.

8 ion of cyanoolefins to 1-4 followed by retro-electrocyclization.

9 ia Wittig reaction followed by photochemical electrocyclization.

10 rmation occurs through a 4pi-electron-5-atom electrocyclization.

11 med from 2 via a photochemical four-electron electrocyclization.

12 two distinct reaction channels, namely, 6pi-electrocyclization (2 --> 3) and [1,5]H-sigmatropic shif

13 s of reactivity and selectivity, both in the electrocyclization and in the subsequent transformations

14 d C-H activation-alkyne coupling followed by electrocyclization and subsequent acid/borohydride-promo

15 The 6pi electrocyclizations and Nazarov cyclizations of a series

16 e exploited to forge the carbazole core: 6pi-electrocyclization/aromatization and indole C2-H bond ac

17 A convenient one-pot C-H alkenylation/electrocyclization/aromatization sequence has been devel

18 construct the trans-decalin ring, and a 6pi-electrocyclization/aromatization sequence to produce the

19 the corresponding precursors followed by 6pi-electrocyclization/aromatization, while isomeric TD-syn-

20 In some cases, electrocyclization can lead to substituted fluorene prod

21 olecular CH alkenylation/torquoselective 6pi electrocyclization cascade provides a fused bicyclic 1,2

22 ium(II)-catalyzed oxidative homocoupling/8pi-electrocyclization cascade.

23 p) computations are reported for the 8pi-6pi electrocyclization cascades of 1,3,5,7-tetraenes.

24 rhodium catalyzed C-H bond functionalization/electrocyclization/dehydration procedure has been develo

25 A novel stereoselective electrocyclization developed for the total synthesis of

26 raenes undergo facile but less exergonic 8pi electrocyclization due to a steric clash that destabiliz

27 ode of ring closure is favored for these 6pi electrocyclizations due to a steric interaction that des

28 s similar ones of ours involving the 3 --> 4 electrocyclization (essentially pericyclic), the 11 -->

29 ents indicate that the reaction occurs by an electrocyclization followed by 1,3-proton transfer.

30 hich undergoes a photochemical four-electron electrocyclization followed by a rearrangement.

31 ee steps of the sequence are stereospecific: electrocyclization followed by two [1,2]-suprafacial Wag

32 and iodine-mediated oxidative photochemical electrocyclization for construction of the ABCD ring moi

33 The key steps include a 6pi-1-azatriene electrocyclization for formation of the pyridine ring an

34 leads to its photochemical isomerization and electrocyclization, giving rise to different byproducts.

35 nce is presented for both retro-4pi and -6pi electrocyclization in these systems, lending support to

36 ocyclic ring opening-proton transfer and 6pi electrocyclization, in which a variety of functional gro

37 For 2a, k[1,5]H-shift:k6pi-electrocyclization increases from 1:13 at CVT level to 1

38 the C-N regiospecificity of the photoinduced electrocyclization is a general feature of ortho-styryl-

39 6pi electrocyclization step of these cascade electrocyclizations is also potentially diastereoselecti

40 The first case of catalysis in oxa 6pi electrocyclizations is reported.

41 sional effects, but for highly exo selective electrocyclizations, it is reinforced by a second effect

42 ly substituted carbazole via a retro-4pi/6pi-electrocyclization-N-acylation cascade reaction to provi

43 rization and irreversible intramolecular 6pi electrocyclization of 1,3-cis,5-hexatriene sequences fol

44 ction that proceeds via pseudopericyclic 1,5-electrocyclization of 2-azabutadiene into 7aH-indolium y

45 n of a cis-bicyclo[3.1.0]hexene derived from electrocyclization of a cyclohexadienyl carbanion.

46 diate and an apparent Woodward-Hoffmann-type electrocyclization of a five-atom diyl array.

47 Combinations of electrocyclization of dithienylethene, Z/E isomerization

48 mino reaction sequence entailing the Nazarov electrocyclization of divinyl ketones and nucleophilic a

49 azoles via a tandem catalytic cross-coupling/electrocyclization of enol triflates and diazoacetates i

50 The details of the 1,5-electrocyclization of the carbonyl nitrile ylide 4 and i

51 Electrocyclization of the corresponding cyclononadienyl

52 turated ketoxime O-pentafluorobenzoates, (2) electrocyclization of the resulting 3-azatriene, and (3)

53 -Lam coupling and subsequent spontaneous 6pi electrocyclization of these intermediates for the synthe

54 he products via rate-determining conrotatory electrocyclization of zwitterionic intermediates.

55 Electrocyclizations of 1,3,5-hexatrienes containing up t

56 space (CAS) molecular orbitals (MOs) for the electrocyclizations of 3, 5, 7, 9, and 10 suggest that i

57 l. have reported a series of torquoselective electrocyclizations of chiral 1-azahexa-1E,3Z,5E-trienes

58 ted, as well as parallel calculations on the electrocyclizations of hepta-1,2,4,6-tetraene 5, hexa-1,

59 orm 1,3,5-cyclooctatrienes; however, the 6pi electrocyclizations of these cyclooctatriene intermediat

60 cific live-cell imaging probe based on a 6pi electrocyclization/oxidation mechanism is described.

61 An extension of the tandem coupling/4pi-electrocyclization pathway was demonstrated by a palladi

62 favorable energetically than an alternative electrocyclization pathway.

63 The carbolithiation and electrocyclization processes are examined using low-temp

64 ing followed by a ring flip and a subsequent electrocyclization proposed by Nicolaou, was computation

65 A diastereoselective tandem Stille-oxa-electrocyclization reaction has been developed which pro

66 The photochemical electrocyclization reaction of the title compound in the

67 2] cycloaddition and 6 pi --> 4 pi + 2 sigma electrocyclization reactions of 1.

68 he zwitterionic MOFs in three representative electrocyclization reactions: [2 + 1] cycloisomerization

69 ectivity through either Nazarov (4pi) or 6pi electrocyclization, respectively.

70 Stereoinduction in the electrocyclization results from a "coupled-torque" mecha

71 Electrocyclization, ring cleavage, hydrogen shift, carbo

72 An electrocyclization route to azetidine nitrones from N-al

73 include one based on a novel aza-Wittig-6pi-electrocyclization sequence and others based on ring-clo

74 volves a sigmatropic migration, elimination, electrocyclization sequence.

75 The 6pi electrocyclization step of these cascade electrocyclizat

76 s is reported through a novel diboration/6pi-electrocyclization strategy.

77 it impacts the DHIs' optical properties and electrocyclization (switching) rates to the spiro confor

78 ropanes, and (3) undergo a Nazarov-like 6-pi electrocyclization that upon reduction give 2-azabicyclo

79 After the initial 4pi electrocyclization, this reaction proceeds via two diffe

80 deauration step promotes ring closure by 1,7-electrocyclization through an intramolecular Pictet-Spen

81 ctadienyl anions readily undergo disrotatory electrocyclization to cis-bicyclo[3.3.0]octenyl systems,

82 n heating, nitrodienes rearrange through 6pi-electrocyclization to form nitronate intermediates, whic

83 E,E)-1,3-dienes that undergo spontaneous 4pi-electrocyclizations to form bicyclic cyclobutenes.

84 o experience intramolecular [1,5]- and [1,3]-electrocyclizations to produce reactive cyclopropenes an

85 embered ring that favors one helicity of the electrocyclization transition state.

86 , and only in one of the allowed disrotatory electrocyclization transition states is the ideal stereo

87 ntrols the conformational preferences at the electrocyclization transition states, and only in one of

88 The electrocyclization transition structures in which the th

89 The interactions of these helical electrocyclization transition structures with the chiral

90 It was found that after 4pi electrocyclization, two different pathways are available

91 The intermediate cations undergo facile 4pi-electrocyclization under ambient condition to give diver

92 sting cascade sequence involving facile 6 pi electrocyclizations which leads to complex benzopyran sy

93 Instead of this, 1,6-electrocyclization with participation of phenyl substitu

94 termediacy of indolidene intermediates whose electrocyclizations (with or without copper present) def