DOUBLE METAL-CATALYZED CROSS-COUPLING REACTIONS OF ALKENYL SULFOXIMINES WITH DIORGANOZINC REAGENTS - SYNTHESIS OF OPTICALLY-ACTIVE AXIAL CHIRAL ALLYLIC SILANES

Nickel- and magnesium-catalyzed cross-coupling reaction of the alkenyl sulfoximine 5 with the pure diorganozinc reagents 6a and 6b gave the optically active allylic silanes 7a and 7b, respectively. Single metal catalysis was sufficient for the substitution of the bromide rac-9 whereas the sulfone rac-10 did neither under the conditions of single nor under that of double metal catalysis react with 6a.