Facile Construction of Vicinal Quaternary and Tertiary Stereocenters via Regio- and Stereoselective Organocatalytic Michael Addition to Nitrodienes
作者:Pankaj Chauhan、Swapandeep Singh Chimni
DOI:10.1002/adsc.201100618
日期:2011.11
protocol for the synthesis of vicinal quaternary and tertiary stereocenters has been developed. The 6′-OH Cinchona alkaloids (BnCPN or BnCPD) at low catalyst loading (0.5–5 mol%) catalyze the Michaeladdition of trisubstituted carbon nucleophiles to nitrodienes in good to excellent yield (up to >99), high enantioselectivity (up to 99% ee) and high diastereoselectivity (up to >99:1 dr) under mild reaction