Cuprate reagents in the presence of trimethylchlorosilane add with excellent Tr-face selectivity and yield to α,β-unsafcurated ketone and aldehyde bearing In γ-position a masked aldehyde represented by the C-2 of a norephedrine-derlved oxazolidine. The title compounds are obtained in high enantlomeric excess after removal of the chiral auxiliary and of the protective group.
在三
甲基氯硅烷存在下的
铜酸盐试剂具有极佳的Tr-face选择性,并生成α,β-不饱和的酮和带有醛的醛。在γ-位置上,由去氧
麻黄碱衍生的
恶唑烷的C-2代表被掩盖的醛。除去手性助剂和保护基后,以高对映体过量得到标题化合物。