A highlyenantioselective three-component reaction of ynamides with carboxylic acids and 2,2′-diester aziridines has been realized by using a chiralN,N′-dioxide/Ho(OTf)3 complex as a Lewis acid catalyst. The process includes the formation of an α-acyloxyenamide intermediate through the addition of carboxylic acids to ynamides and the following enantioselective nucleophilic addition to in-situ-generated
The enantioselective [3 + 1]-cycloaddition of racemic donor–acceptor (D–A) aziridines with isocyanides was first realized under mild reaction conditions using a chiral N,N′-dioxide/MgII complex as catalyst, providing a facile route to enantioenriched exo-imido azetidines with good to excellent yield (up to 99%) and enantioselectivity (up to 94% ee). An obvious chiral amplification effect was observed
A novel early and late transition-metal relay catalysis has been developed by combining a gold-catalyzedcycloisomerization and a Yb(OTf)3-catalyzed diastereoselective [3 + 2] cycloaddition with aziridines in a selective C–C bond cleavage mode. Various biologically significant complex nitrogen-containing spiro heterocycles were rapidly constructed from readily available starting materials under mild
An enantioselective [3+2] annulation of donor-acceptor aziridines with aldehydes has been realized using Nd(OTf)3/N,N[prime or minute]-dioxide/LiNTf2 catalyst system, providing various chiral cis-1,3-oxazolidines in moderate to good yields with high level of stereocontrol....
Diastereoselective synthesis of functionalized tetrahydro-γ-carbolines via a [3 + 3] cycloaddition of 2,2′-diester aziridines with β-(indol-2-yl)-α,β-unsaturated ketones
作者:Xuejie Zou、Yangzi Liu、Shaojing Shang、Wulin Yang、Weiping Deng
DOI:10.1016/j.cclet.2019.09.002
日期:2020.5
Abstract A Sc(OTf)3-catalyzed [3 + 3] cycloaddition of 2,2′-diester aziridines with β-(indol-2-yl)-α,β-unsaturated ketones was developed, affording polysubstituted tetrahydro-γ-carbolines in single diastereoisomers in good to excellent yields.