Reactions of o-Quinone Methides with Halogenated 1H-Azoles: Access to Benzo[e]azolo[1,3]oxazines
作者:Vitaly Osyanin、Dmitry Osipov、Leonid Voskressensky、Yuri Klimochkin
DOI:10.1055/s-0036-1588411
日期:——
and intramolecular nucleophilic substitution. A simple route to the series of azolo-condensed benzo[e][1,3]oxazines such as 9H-benzo[e][1,2,4]triazolo[5,1-b][1,3]oxazines, 9H-benzo[e]pyrazolo[5,1-b][1,3]oxazines, and 5H-benzo[e]imidazo[2,1-b][1,3]oxazines has been developed. The reaction proceeds through formation of an ortho-quinone methide intermediate followed by aza-Michael addition of the halogenoazoles
摘要 一系列偶氮缩合的苯并[ e ] [1,3]恶嗪如9 H-苯并[ e ] [1,2,4]三唑[5,1- b ] [1,3]恶嗪的简单途径已经开发了9 H-苯并[ e ]吡唑并[5,1- b ] [1,3]恶嗪和5 H-苯并[ e ]咪唑并[2,1- b ] [1,3]恶嗪。该反应通过形成邻-醌甲基化物中间体,然后将卤代唑的氮杂-迈克尔加成至邻-醌甲基化物和分子内亲核取代来进行。 一系列偶氮缩合的苯并[ e ] [1,3]恶嗪如9 H-苯并[ e ] [1,2,4]三唑[5,1- b ] [1,3]恶嗪的简单途径已经开发了9 H-苯并[ e ]吡唑并[5,1- b ] [1,3]恶嗪和5 H-苯并[ e ]咪唑并[2,1- b ] [1,3]恶嗪。该反应通过形成邻-醌甲基化物中间体,然后将卤代唑的氮杂-迈克尔加成至邻-醌甲基化物和分子内亲核取代来进行。