Photolytic ring-expansions of 6-azidoquinolines and 6-azidodiazines: some unexpected azepine ring-opening reactions
作者:Roy Hayes、Joseph M. Schofield、Robert K. Smalley、David I.C. Scopes
DOI:10.1016/s0040-4020(01)89775-1
日期:1990.1
Photolysis of 6-azidoquianazoline in MeOH-KOMe-dioxan yields 8,9-dihydro-5,7-dimethoxy-5H-pyrimido[5,4-]azepine (5) which on acid hydrolysis ring-opens to the pyrimidine-carbaldehyde (7). The mechanism of formation of this unexpected dimethoxypyrimido-azepine is discussed and related to previous similar results involving 6-azido-2,3-dihydrofuro- and 6-azido-23-dihydrothieno-[2,3-b]quinolines
6-叠氮喹啉在MeOH-KOMe-二恶烷中的光解产生8,9-二氢-5,7-二甲氧基-5H-嘧啶并[5,4-]氮杂(5),在酸水解时开环反应成嘧啶-甲醛( 7)。讨论了这种意外的二甲氧基嘧啶基-氮杂a的形成机理,并与先前涉及6-叠氮基-2,3-二氢呋喃基和6-叠氮基-23-二氢噻吩基-[2,3-b]喹啉的类似结果相关联