Novel spiro cyclisations of N-acyliminium ions involving an aromatic π-nucleophile
作者:Patrick D. Bailey、Keith M. Morgan、David I. Smith、John M. Vernon
DOI:10.1016/0040-4039(94)88240-1
日期:1994.9
Several spiro 2-pyrrolidin-5-ones were obtained by a two-step procedure from N-substituted succinimides, involving spiro cyclisation of N-acyliminium ion intermediates in refluxing trifluoroacetic acid; in all cases cyclisation utilised a tethered aromatic π-nucleophile, and ring-closure followed 5- or 6-exo-trig pathways.
通过两步程序从N-取代的琥珀酰亚胺中获得了几个螺2-吡咯烷基-5-酮,包括在回流的三氟乙酸中螺环化N-酰亚胺离子中间体。在所有情况下,环化均利用系留的芳香族π-亲核试剂,且闭环遵循5或6 -exo-trig途径。