Stereocontrolled desymmetrization of 2,5-cyclohexadienones via organocatalytic domino sulfa-1,6-/1,4-addition or sulfa-1,6-/1,4-/sulfa-1,4-addition reactions

A squaramide-catalyzed regio-/enantioselective sulfa-1,6-addition initiated highly enantio- and diastereoselective desymmetrization of 2,5-cyclohexadienone-tethered 3-cyano-4-styrylcoumarins has been disclosed.