1,3,4-Benzotriazepinones. Formation and rearrangement
作者:Peter Scheiner、Leroy Frank、Irene Giusti、Sara Arwin、Shirley A. Pearson、Frendy Excellent、Althea P. Harper
DOI:10.1002/jhet.5570210649
日期:1984.11
but formed reversibly they subsequently rearrange to 2 and 4. Aminoquinazolinone formation is suppressed in aprotic solvents at moderate temperatures. Earlier failures to obtain 1 are due to its tendency to isomerize. Acid, base and thermal rearrangements have been observed. Mechanisms are proposed for the formation of 1, 2 and 4, and for the rearrangements of the benzotriazepinones. Pyrazolo- and
邻氨基苯甲酰肼与原酸酯反应生成3种产物的混合物:3,4-二氢-5 H -1,3,4-苯并三氮杂-5-酮(1),3-氨基-3,4-二氢-4-喹唑啉酮(2)和2-(2-氨基苯基)-1,3,4-恶二唑(4)。这些材料的来源已被调查。产品分布取决于取代基的性质,溶剂和时间。在乙醇中,苯并三氮杂吡啶酮在动力学上受到青睐,但可逆地形成,随后它们重排至2和4。在中等温度下,在质子惰性溶剂中抑制了氨基喹唑啉酮的形成。早期未能获得1是由于其趋于异构化的趋势。已经观察到酸,碱和热重排。提出了形成1、2和4以及重排苯并三氮杂吡啶酮的机理。由相应的邻氨基唑酰肼制备了吡唑并-和咪唑并三氮杂吡啶酮。