Rh<sup>I</sup>-Catalyzed Cycloisomerization of Vinyl Bicyclopropyl Compounds to Azabicyclo[3.2.2]nona-2,8-dienes
作者:Sun Young Kim、Youn K. Kang、Young Keun Chung
DOI:10.1002/chem.200902284
日期:2010.5.10
Nitrogen‐containing heterobicycles are an important structural motif ubiquitous in natural alkaloids. We found that azabicyclo[3.2.2]nona‐2,8‐dienes can be synthesized from vinyl bicyclopropropyl derivatives in the presence of a RhI catalyst (see scheme). Syntheses of such compounds and an investigation into the reaction mechanism through DFT calculations are presented.
Copper‐Catalyzed Azide–Ynamide Cyclization to Generate α‐Imino Copper Carbenes: Divergent and Enantioselective Access to Polycyclic N‐Heterocycles
作者:Xin Liu、Ze‐Shu Wang、Tong‐Yi Zhai、Chen Luo、Yi‐Ping Zhang、Yang‐Bo Chen、Chao Deng、Rai‐Shung Liu、Long‐Wu Ye
DOI:10.1002/anie.202007206
日期:2020.10.5
Here an efficient copper‐catalyzed cascade cyclization of azide‐ynamides via α‐imino copper carbene intermediates is reported, representing the first generation of α‐imino copper carbenes from alkynes. This protocol enables the practical and divergent synthesis of an array of polycyclic N‐heterocycles in generally good to excellent yields with broad substrate scope and excellent diastereoselectivities
Generation of Donor/Donor Copper Carbenes through Copper-Catalyzed Diyne Cyclization: Enantioselective and Divergent Synthesis of Chiral Polycyclic Pyrroles
作者:Feng-Lin Hong、Ze-Shu Wang、Dong-Dong Wei、Tong-Yi Zhai、Guo-Cheng Deng、Xin Lu、Rai-Shung Liu、Long-Wu Ye
DOI:10.1021/jacs.9b09303
日期:2019.10.23
yields with wide substratescope and excellent enantioselectivities (up to 97:3 e.r.). Importantly, this protocol represents the first copper-catalyzed asymmetric diyne cyclization. Moreover, mechanisticstudies revealed that the generation of donor/donor copper carbenes is presumably involved in this 1,5-diyne cyclization, which is distinctively different from the related gold catalysis, and thus it constitutes
Synthesis of 3-exo-Aroylhexahydroindoles via Sequential Gold(I)-Catalyzed Claisen-Type Rearrangement–Epimerization Reactions of cis-4-[N-Tosyl-N-(3-arylprop-2-ynyl)amino]cyclohex-2-en-1-ols
作者:Ming-Chang Yeh、Chia-Jung Liang、Xuan-Yi Jiang
DOI:10.1055/s-0033-1339129
日期:——
ether intermediate underwent a gold-assisted [3,3]-sigmatropicrearrangement to form 3-exo-3-aroylhexahydroindole derivatives. A two-step process for the synthesis of 3-exo-aroylhexahydroindoles is described. cis-4-[N-Tosyl-N-(3-arylprop-2-ynyl)amino]cyclohex-2-en-1-ols were cycloisomerized with a catalytic amount of chloro(triphenylphosphine)gold(I)/silver(I) hexafluoroantimonate (AuPPh3Cl/AgSbF6); subsequent
Copper‐Catalyzed Asymmetric Diyne Cyclization via [1,2]‐Stevens‐Type Rearrangement for the Synthesis of Chiral Chromeno[3,4‐
<i>c</i>
]pyrroles
作者:Feng‐Lin Hong、Chong‐Yang Shi、Pan Hong、Tong‐Yi Zhai、Xin‐Qi Zhu、Xin Lu、Long‐Wu Ye
DOI:10.1002/anie.202115554
日期:2022.2.7
copper-catalyzed asymmetric cascade cyclization/[1,2]-Stevens-type rearrangement is disclosed, affording valuable chiral chromeno[3,4-c]pyrroles bearing a quaternary carbon stereocenter in generally moderate to good yields with excellent enantioselectivities. Importantly, this protocol represents the first catalytic asymmetric [1,2]-Stevens-type rearrangement based on alkynes and the first asymmetric formal carbene
公开了一种铜催化的不对称级联环化/[1,2]-Stevens 型重排,以通常中等至良好的产率和优异的对映选择性提供有价值的手性色烯并[3,4- c ]吡咯,其具有季碳立体中心。重要的是,该协议代表了第一个基于炔烃的催化不对称 [1,2]-史蒂文斯型重排和第一个不对称的形式卡宾插入 Si-O 键。