Azinoiminophosphorane mediated 4H,8H-1,2,4-triazolo[1,5-c][1,3]oxazepin-4-ones and 5,6-dihydro-7H,12H-naphtho[2,1-f][1,2,4]triazolo[1,5-c][1,3]oxazepin-7-one s synthesis

摘要

The aza-Wittig reactions of benzaldehyde-, acetophenone- and benzophenone 1-[(triphenylphosphoranylidene)amino]ethylidenehydrazones (1) with 2,3-furandiones 6 provide a new route to 4H,8H-1,2,4-triazolo[1,5-c][1,3]oxazepin-4-ones 14 or 5,6-dihydro-7H,12H-naphtho[2,1-f][1,2,4]triazolo[1,5-c][1,3]oxazepin-7-one s 17 via the thermal reaction of the expected azinoimine vinylogous lactones. [References: 11]