A Route to 2-Alkenyl-3-(<i>tert</i>-butyldiphenylsilyl)amines and Application to the Construction of a Tricyclic Ring System
作者:Veejendra K. Yadav、Bharat D. Narhe、Kamlesh Kumar、Vijaykumar Hulikal
DOI:10.1002/ejoc.201300319
日期:2013.7
3-dialkyl-2-(tert-butyldiphenylsilylmethyl)azetidines rearrange smoothly into the corresponding 2-alkenyl-3-(tert-butyldiphenylsilyl)amines upon exposure to BF3·OEt2 in CH2Cl2. The reaction involves sequential σC–N bond cleavage, 1,2-migration of the N-tosyl-aminomethyl group, and deprotonation of the resultant tert-carbenium ions. For the instance in which the carbenium ion formed from migration of the N-tosyl-aminomethyl
N-甲苯磺酰基 3,3-二烷基-2-(叔丁基二苯基甲硅烷基甲基)氮杂环丁烷在暴露于 CH2Cl2 中的 BF3·OEt2 时顺利地重排成相应的 2-烯基-3-(叔丁基二苯基甲硅烷基)胺。该反应包括连续的 σC-N 键断裂、N-甲苯磺酰基-氨基甲基的 1,2-迁移以及所得叔碳正离子的去质子化。对于由 N-甲苯磺酰基-氨基甲基迁移形成的碳鎓离子高度稳定的例子,例如,由于是叔和苄基,迁移与 σC-N 键断裂同步发生,这导致产物中带有叔丁基二苯基甲硅烷基甲基的碳原子的高度构型控制。