Studies concerning the electrophilic amino-alkene cyclisation for the synthesis of bicyclic amines
作者:Johannes E. M. N. Klein、Helge Müller-Bunz、Paul Evans
DOI:10.1039/b819610a
日期:——
octahydroquinoline 2i. The presence of an N-substituent bearing a stereogenic centre (1h and 1i) was studied and the products 2h and 2i were isolated with no diastereoselectivity. When NBS was used a novel cyclisation, forming bromo-substituted octahydroindoles 9a,b and d, was observed. In relation to this sequence it was shown that these products were not intermediates in the former Br2/PHT processes and that
已使用Br 2,PHT和NBS研究了一系列环己烯基取代的仲胺1a-i的溴化。在Br 2和NBS的情况下,仲胺优先进行N-溴化。相反,PHT干净地提供了烯烃二溴化产物。在溴的情况下,2的Ñ溴物种然后给烯烃二溴化的产物,尽管效率较低。随后用K 2 CO 3处理时,这些二溴化物形成相应的六氢吲哚2a-h和八氢喹啉 2i。研究了带有立体定位中心的N-取代基(1h和1i)的存在,并且分离了产物2h和2i,没有非对映选择性。当使用NBS进行新型环化时,观察到形成溴取代的八氢吲哚9a,b和d。关于该序列,表明这些产物不是先前的Br 2 / PHT过程中的中间体,并且该反应仅在N-溴化的琥珀酰亚胺副产物的存在下进行。