Diastereoselective alkylation and reduction of β-alkoxyacylsilanes: stereoselective construction of three contiguous stereogenic centers

The nucleophilic addition reaction to acylsilanes, having stereogenic centers at the α and β positions, derived from the aldol reaction of dimethyl acetals and acylsilane silyl enol ethers gives the corresponding α-silylalcohols in high yields with excellent diastereoselectivity. The protiodesilylation of α-silylalcohols proceeds with complete retention of the configuration. In addition, the reduction of acylsilanes having stereogenic centers at the α and β positions affords the corresponding α-silylalcohols in good yields with high diastereoselectivity similarly to the nucleophilic addition. And the treatment of acylsilanes having a phenyl group on silicon atom with fluoride ion results in the formation of phenyl carbinol derivatives via migration of the phenyl group with high diastereoselectivity.