Visible-Light-Induced Trifluoromethylation of Isonitrile-Substituted Indole Derivatives: Access to 1-(Trifluoromethyl)-4,9-dihydro-3<i>H</i>-pyrido[3,4-b]indole and<i>β</i>-Carboline Derivatives
作者:Jiaxin Liu、Longhai Li、Liuzhu Yu、Lisha Tang、Qin Chen、Min Shi
DOI:10.1002/adsc.201800568
日期:2018.8.6
visible‐light‐induced trifluoromethylation of isonitrile‐substituted indolederivatives has been developed from the reaction of isonitrile‐substituted indoles with Togni II reagent, affording 1‐(trifluoromethyl)‐4,9‐dihydro‐3H‐pyrido[3,4‐b]indoles in moderate to good yields. The further transformations to β‐carboline derivatives and a harmacine derivative have been performed, demonstrating the potential synthetic
through a cascadereaction between 2‐isocyanoethylindole and alkylidene malonates catalyzed by a chiral N,N′‐dioxide/MgII catalyst. Fused polycyclic indolines containing three stereocenters were afforded in good yields with excellent diastereo‐ and enantioselectivities through a Michael/Friedel–Crafts/Mannich cascade. When 2‐substituted 2‐isocyanoethylindoles were used, spiroindoline derivatives were obtained
A Highly Regio- and Diastereoselective Four-Component Reaction to Construct Polycyclic Bispiroindolines from 2-Isocyanoethylindoles and Isocyanates
作者:Longhai Li、Jiaxin Liu、Min Shi
DOI:10.1021/acs.orglett.8b03019
日期:2018.11.16
one-pot multicomponent domino reaction between 2-isocyanoethylindoles and isocyanates for the diastereoselective construction of polycyclic bispiroindolines was developed. Fused polycyclic bispiroindolines containing two contiguous spiral atoms were afforded in moderate to good yields with excellent regio- and diastereoselectivities through a four-component Ugi-type reaction (U-4CR) under mild conditions
Hydrogen‐Bonding‐Promoted Cascade Rearrangement Involving the Enlargement of Two Rings: Efficient Access to Polycyclic Quinoline Derivatives
作者:Wen‐Bin Cao、Shijun Li、Meng‐Meng Xu、Haiyan Li、Xiao‐Ping Xu、Yu Lan、Shun‐Jun Ji
DOI:10.1002/anie.202008110
日期:2020.11.23
An efficient cascade reaction of tryptamine‐derived isocyanides with C,N‐cyclic azomethine imines is described. The polycyclic pyrrolo[2,3‐c]quinoline derivatives, which benefited from rearrangement process driven by hydrogen bonding, could be directly assembled in moderate to good yields (40–87 %) under metal‐free and mild conditions. This transformation involved four new heterocyclic rings formations
Tandem Cross‐Coupling/Spirocyclization/Mannich‐Type Reactions of 3‐(2‐Isocyanoethyl)indoles with Diazo Compounds toward Polycyclic Spiroindolines
作者:Guo‐Shu Chen、Shu‐Jie Chen、Jian Luo、Xiang‐Yu Mao、Albert Sun‐Chi Chan、Raymond Wai‐Yin Sun、Yun‐Lin Liu
DOI:10.1002/anie.201911614
日期:2020.1.7
and subsequent spirocyclization/Mannich-type reaction have been developed to assemble polycyclic spiroindoline skeletons. Formation of spiroindolenines has been proven as the crucial step for the following Mannich-type cyclization reaction. Accordingly, a novel approach on chiral phosphoric acid catalyzed Mannich-type cyclization toward the formation of diastereomerically and enantiomerically enriched