Asymmetric [2,3]-sigmatropic wittig rearrangement of chiral α-allyloxy-hydrazones
作者:Dieter Enders、Dirk Backhaus、Jan Runsink
DOI:10.1016/0040-4020(95)00982-5
日期:1996.1
[2,3]-Wittig rearrangement of chiral α-allyloxy-hydrazones (S)-3 and (S)-7 proceeds with very good yields (72 – 100%) together with high syn-selectivities (87 – 97%) and asymmetric inductions (63 – 92%) to give the corresponding α-hydroxyhydrazones 4 and 8. Depending on the substitution patterns of the starting material, optically active aliphatic and aromatic α-hydroxyketones 5 or protected cyanohydrins
不对称[2,3] -Wittig手性α烯丙氧基腙(重排小号)-3和(小号)-7具有非常良好的产率继续进行(72 - 100%)以高一起顺-selectivities(87 - 97%的)和不对称感应(63-92%)得到相应的α-羟基hydr 4和8。根据原料的取代方式,可以高对映体过量(92 – 98%)和顺选择性(88 – > 99%)色谱纯化并除去辅助剂后。