Generation and intramolecular cyclization of (2-ethenylphenyl)bisketenes. Synthesis of benzofuranones
作者:Matthew J Heileman、Harold W Moore
DOI:10.1016/s0040-4039(98)00638-8
日期:1998.5
Several new differentially substituted cyclobutenediones 4a-e have been prepared. Their thermal rearrangement to substituted naphthofuranones 5a-d is reported. This rearrangement involves an unprecedented intramolecular cyclization of a reactive bisketene 6, and forms the naphthofuranone system in good yield. (C) 1998 Elsevier Science Ltd. All rights reserved.