Diiodine–Triethylsilane System: Reduction of N-Sulfonyl Aldimines to N-Alkylsulfonamides
作者:Jin Jiang、Lili Xiao、Yu-Long Li
DOI:10.1055/s-0040-1706544
日期:2021.2
using these reagents are easy to operate and require mild reaction conditions. Molecular iodine and a hydrosilane were used to reduce N-sulfonyl aldimines to the corresponding N-alkylsulfonamides. This transformation is a practicalmethod for the synthesis of N-alkylsulfonamides.
N-Heterocyclic carbene-catalyzed [3+3] cyclocondensation of bromoenals with aldimines: highly enantioselective synthesis of dihydropyridinones
作者:Zhong-Hua Gao、Xiang-Yu Chen、Han-Ming Zhang、Song Ye
DOI:10.1039/c5cc04593b
日期:——
The N-heterocycliccarbene-catalyzed [3+3] cyclocondensation of bromoenals with aldimines was developed to give the corresponding dihydropyridinones in good yields with excellent enantioselectivies.
method for the efficient syntheses of optically active 1-alkyl homoallylic amines in yields up to 95%, 13.5:1 dr, and 98% ee under mild, aqueous reaction conditions, via the Rh-catalyzed asymmetric allylation of aliphatic aldimines. This method provides a streamlined synthetic platform for the preparation of indolizidine and piperidine alkaloids, thus demonstrating its usefulness.
Asymmetric Friedel−Crafts Reaction of Indoles with Imines by an Organic Catalyst
作者:Yong-Qiang Wang、Jun Song、Ran Hong、Hongming Li、Li Deng
DOI:10.1021/ja062700v
日期:2006.6.1
In this communication, we report an asymmetric Friedel-Craftsreaction of indoles with imines catalyzed by a bifunctional cinchona alkaloid catalyst. This is the first efficient organocatalytic asymmetric Friedel-Craftsreaction of indoles with imines. This reaction is operationally simple and, unprecedentedly, affords high enantioselectivity for a wide range of indoles and both aryl and alkyl imines
Use of a sterically demanding Lewis acid to direct ring expansion of monoactivated methylenecyclopropanes
作者:Catherine Taillier、Yann Bethuel、Mark Lautens
DOI:10.1016/j.tet.2007.05.081
日期:2007.8
A novel syntheticroute for the preparation of functionalized alkylidene pyrrolidines via a MAD/n-Bu4NI-mediated ringexpansion of monoactivated MCP was developed. The substrate scope for this reaction was found to be broad for a variety of aldimines and symmetrically as well as unsymmetrically monoactivated MCPs yielding the corresponding five-membered heterocyclic compounds in good yields (up to
开发了一种通过MAD / n - Bu 4 NI介导的单活化MCP扩环制备官能化亚烷基吡咯烷的新颖合成途径。发现该反应的底物范围对于多种醛亚胺而言是宽泛的,并且对称地以及非对称地单活化的MCP以良好的产率(高达92%)产生相应的五元杂环化合物。该方法是对以前有关MCP环扩环的报告的补充,该报告显示,只需改变催化剂体系,就可以从同一MCP中实现不同杂环骨架的选择性合成。