Enantioselective Rhodium-Catalyzed [4 + 2] Cycloaddition of α,β-Unsaturated Imines and Isocyanates
摘要:
A [4 + 2] cycloaddition of alpha,beta-unsaturated imines and isocyanates catalyzed by a phosphoramidite rhodium complex provides pyrimidinones in good yields and high enantioselectivities.
Enantioselective Rhodium-Catalyzed [4 + 2] Cycloaddition of α,β-Unsaturated Imines and Isocyanates
作者:Kevin M. Oberg、Tomislav Rovis
DOI:10.1021/ja200766k
日期:2011.4.6
A [4 + 2] cycloaddition of alpha,beta-unsaturated imines and isocyanates catalyzed by a phosphoramidite rhodium complex provides pyrimidinones in good yields and high enantioselectivities.
A Selective Transformation of Enals into Chiral γ-Amino Alcohols
作者:Adam D. J. Calow、Andrei S. Batsanov、Alba Pujol、Cristina Solé、Elena Fernández、Andrew Whiting
DOI:10.1021/ol4022029
日期:2013.9.20
A one-pot synthesis of chiral amino alcohols from alpha,beta-unsaturated aldehydes is reported which circumvents competitive 1,2-versus 1,4-boryl addition, by means of using a sterically hindered amine-derived imine. In addition to the complete chemoselectivity, modification of the Cu(I) catalyst with readily available chiral diphosphines, such as (R)-DM-BINAP, gave the 1,4-boryl addition products with high levels of asymmetric induction.
10.1055/s-0043-1775367
作者:Chitsomkhuan, Saranya、Buakaew, Supawadee、Samec, Joseph S. M.、Chuawong, Pitak、Saymaya, Jenjira、Kuntiyong, Punlop、Pluempanupat, Wanchai、Akkarasamiyo, Sunisa
DOI:10.1055/s-0043-1775367
日期:——
α-Amino ketones were synthesized by a Meinwald rearrangement of biomass-based amino epoxides using copper(II) triflate as a catalyst. The regioselectivity of the rearrangement can be rationalized in terms of the reaction proceeding via the most stable carbocationic intermediate to give various α-amino α′-aryl ketones in moderate to good yields. This is an attractive method to prepare α-amino ketones