4-Oxo-1,2,3,4-tetrahydroquinazolines, V. Ring Expansion Reaction of 1-Methyl-3-phenyl-4-oxo-3,4-dihydroquinazolinium Bromide with Diazoalkanes
作者:Yoshihisa Yamada、Toyonari Oine、Ichizo Inoue
DOI:10.1246/bcsj.47.339
日期:1974.2
Reactions of 1-methyl-3-phenyl-4-oxo-3,4-dihydroquinazolinium bromide (13) with diazoalkanes were investigated. Treatment of 13 with diazomethane in EtOH gave a ring-expansion product 14 in a good yield. A mechanism which involves the formation of azirinoquinazolinium bromide and a subsequent SN1 type ring opening was discussed. Treatment of 13 with phenyldiazomethane also afforded benzodiazepine 16