SYNTHESIS OF OPTICALLY ACTIVE PENTACOORDINATE SILICATES AND CORRESPONDING ASYMMETRIC ALLYLATION OF ALDEHYDES

The optically active silicates 3a–c and disilicates 5a–b were synthesized. The asymmetric allylation reactions of aldehydes with optically active pentacoordinate allylsilicates were carried out to give optically active homoallylic alcohols 7a–b with 7–25% ee.