Allylsilanes 2 of high enantiomeric purity (ee = 90 − ⩾ 98 %) are prepared in good yields from optically active α-silylaldehydes 1via Wittig olefination with various alkylidene triphenylphosphoranes in high E:Z selectivities (90:10 – 97:3) and without racemization of the α-silylaldehydes. The latter are easily obtained from simple aldehydes and silylating agents employing the SAMP/RAMP-hydrazone method
烯丙基
硅烷2 -高对映体纯度的(EE = 90⩾98%)都以良好的收率制备光学活性的α-silylaldehydes 1通过Wittig烯化,在高的各种亚烷基triphenylphosphoranes Z:ë和: -选择性(3 97 90:10)没有外消旋的α-甲
硅烷基醛。后者可以使用
SAMP /
RAMP hydr方法从简单的醛和甲
硅烷基化试剂中轻松获得。