Organocatalytic asymmetric Michael reaction of α-substituted nitrophosphonates to phenyl vinyl sulfone catalyzed by cinchona alkaloid-derived tertiary amine-thioureas afforded α,α-disubstituted nitrophosphonates in very good yields and excellent enantiomeric excesses.
Key words
thiourea - Michael Addition - cinchona alkaloid - vinyl sulfone - nitrophosphonate