Highly Enantioselective Michael Addition of α-Substituted Nitrophosphonates to a Vinyl Sulfone
摘要:
Organocatalytic asymmetric Michael reaction of alpha-substituted nitrophosphonates to phenyl vinyl sulfone catalyzed by cinchona alkaloid-derived tertiary amine-thioureas afforded alpha,alpha-disubstituted nitrophosphonates in very good yields and excellent enantiomeric excesses.