N-Arylmethyl-7-azabicyclo[2.2.1]heptane derivatives: synthesis and reaction mechanisms
作者:Elena Gómez、José Marco-Contelles、Elena Soriano、María L. Jimeno
DOI:10.1016/j.tet.2009.09.013
日期:2009.11
N-Arylmethyl-7-azabicyclo[2.2.1]heptane (I) derivatives have been synthesized by deprotection of N-protected, N-(arylmethyl)cyclohex-3-enamines, bromination of the resulting secondary cyclohex-3-enamines, followed by base-promoted cyclization (route a), or by bromination of N-protected, N-(arylmethyl)cyclohex-3-enamines followed by deprotection and base-mediated cyclization (route b). In these protocols
N-芳甲基-7-氮杂双环[2.2.1]庚烷(I)衍生物是通过将N-保护的N-(芳甲基)环己-3-烯胺脱保护,溴化所得的仲环己-3-烯胺而合成的,然后通过碱促进的环化(路线a),或溴化N-保护的N-(芳甲基)环己-3-烯胺,然后脱保护并进行碱介导的环化(路线b)。在这些协议中,我们已经观察到,关键中间体(的溴化12,13,和19)是立体选择性导致主要反式-3-顺式-4-二溴化物(14,17和20),其温和的碱介导的杂环化作用(在化合物14上),或两步酸水解加碱促进的环化作用(在化合物17和20上),以高收率得到产物6和7。已经进行了使用DFT的机械研究,以解释这项工作中观察到的结果。