ASYMMETRIC FUNCTIONALIZATION AT A PROCHIRAL CARBON CENTER BY THE AID OF SULFINYL CHIRALITY: A SELECTIVE FORMATION OF 6-SUBSTITUTED (3R,SS)- AND (3S,SS)-3-HYDROXYMETHYL-3,4-DIHYDRO-5-(p-TOLYL)SULFINYL-2H-PYRANS
A successful asymmetric functionalization of prochiral gem-bis(hydroxymethyl) groups has been achieved by the aid of a sulfinyl chirality.