Asymmetric intramolecular Diels-Alder reactions of N-acyl-camphor-sultam trienes.
作者:Wolfgang Oppolzer、Dominique Dupuis
DOI:10.1016/s0040-4039(00)98228-5
日期:1985.1
Treatment of triene-imides 4 with EtAlCl2 at −20° gave crystalline cycloadducts 5 which furnished enantiomerically pure bicyclic alcohols 9 with regeneration of the chiral auxiliary.
Abstract The synthesis of α-chloro-tetrahydrophosphinines by inter- or intramolecular [4+2] cycloaddition reactions involving unstabilized phosphaalkenes is presented. Conditions for a selective base-induced isomerisation of substituted dihydrophosphinines are precised. A tautomeric phosphaalkene/vinylphosphine equilibrium was for the first time evidenced.
Palladium(II) Catalyzed C–H Functionalization Cascades for the Diastereoselective Synthesis of Polyheterocycles
作者:Michael S. Watt、Kevin I. Booker-Milburn
DOI:10.1021/acs.orglett.6b02947
日期:2016.11.4
C–H activation offers huge potential in the generation of complex structures from simple starting materials. Herein we report the development of a highly diastereoselective palladium(II) catalyzed C–H functionalization cascade to produce novel, unsaturated polyheterocycles from simple diene-tethered heterocyclic starting materials. The reaction is applicable to both indole and pyrrole based substrates
Crossed Regio‐ and Enantioselective Iron‐Catalyzed [4+2]‐Cycloadditions of Unactivated Dienes
作者:Elena Braconi、Nicolai Cramer
DOI:10.1002/anie.202112148
日期:2022.2.7
An enantioselective iron-catalyzed cross-[4+2]-cycloaddition of unactivated branched and linear dienes is described. The illustrated process provides a very efficient and atom-economic access to chiral 1,3-substituted vinyl-cyclohexenes under very mild reaction conditions. The development of a chiral bis-dihydroisoquinoline ligand class was essential to obtain excellent levels of chemo-, regio- and
Intramolecular Carboamination of Aminodienes to <i>N</i>‐Heterocycles via C−N Bond Activation
作者:Xuyang Yan、Bangkui Yu、Hongchi Liu、Hanmin Huang
DOI:10.1002/anie.202316563
日期:2024.2.19
An expedient annulative carboamination of aminodienes via C−N bond activation enabled by a unique I2/Ni or benzylhalide/Ni-catalytic system is described. This reaction features high atom-economy and provides rapid access to a range of pyrrolidines, piperidines, and tetrahydroisoquinoline derivatives.
描述了一种通过独特的 I 2 /Ni 或苄基卤/Ni 催化系统实现的 CN 键活化对氨基二烯进行便利的环碳胺化。该反应具有高原子经济性,可以快速获得一系列吡咯烷、哌啶和四氢异喹啉衍生物。