Highly Stereoselective Synthesis of Homoallylic Amines Based on Addition of Allyltrichlorosilanes to Benzoylhydrazones
作者:Ryoji Hirabayashi、Chikako Ogawa、Masaharu Sugiura、Shū Kobayashi
DOI:10.1021/ja011125m
日期:2001.10.1
Allyltrichlorosilanes reacted with benzoylhydrazones in DMF without the use of any catalyst to afford the corresponding homoallylic benzoylhydrazines in good to high yields. The reactions proceeded at 0 degrees C to room temperature under mild conditions. In addition, it was found that the reactions tolerated well the steric hindrance of hydrazones and allyltrichlorosilanes. Indeed, ketone-derived
烯丙基三氯硅烷在 DMF 中与苯甲酰腙反应,无需使用任何催化剂,以良好到高产率提供相应的高烯丙基苯甲酰肼。在温和的条件下,反应在 0 摄氏度至室温下进行。此外,还发现反应能很好地耐受腙和烯丙基三氯硅烷的空间位阻。事实上,酮衍生的苯甲酰腙与烯丙基三氯硅烷顺利反应,以高产率提供相应的 N'-叔烷基-N-苯甲酰肼。在与 (E)- 和 (Z)-巴豆基三氯硅烷的巴豆化中,分别立体定向地获得了顺式和反加合物。这些反应最有可能通过 R 基团占据轴向位置的环状椅子状过渡态进行。当使用α-杂原子取代的手性苯甲酰腙时,观察到高抗非对映选择性。这些加合物可以很容易地以高产率转化为同型烯丙基胺,无需差向异构化。