The cyclisation of benzonitrile 3,3-diarylallyl ylides to give 3H-2-benzazepines: Substituent directive effects and mechanism
作者:Paul W. Groundwater、John T. Sharp
DOI:10.1016/s0040-4039(00)96047-7
日期:1987.1
reaction of imidoyl chlorides with base, cyclised by 1,7-ring closure to give 3H-2-benzazepines (9), in contrast to analogous diazo-compounds (1) which prefer 1,5-electrocyclisation. Asymmetrically placed substituents (R in 14b) favour substitution at the (2′) position irrespective of their polar electronic effects. Deuterium labelling studies have shown that the cyclisation step is irreversible for nitrile