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.
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.