Remote asymmetric induction in diastereoface selective addition reactions of optically active .alpha.-substituted-.beta.-silyl (E)-hexenoates with achiral .alpha.-alkoxy and .beta.-alkoxy acetals
摘要:
Optically active and diastereomerically pure (E)-crotylsilanes 1 function as effective chiral carbon nucleophiles in trimethylsilyl trifluoromethanesulfonate (TMSOTf) catalyzed asymmetric addition reactions of achiral, alpha-alkoxy and beta-alkoxy acetals 2, resulting in the highly diastereo- and enantioselective construction of homoallylic ethers with excellent levels of 1,4- and 1,5-asymmetric induction.