method and the catalytic hydrogenation of 4-keto-5-methyl-1H,4,5-dihydro-1,2,5-benzotriazepine (XI) and reaction with warm hydrochloric acid investigated. Hydrogenation produces fission of the 7-membered ring between positions 1 and 2 and heating with acid produces a ring-contraction yielding an isomer of XI. The structure of this isomer is 1-methyl-2-keto-4-imino-1,2-dihydroquinoxaline (XXV).
通过一种新方法和4-酮基-5-甲基-1 H,4,5-二氢-催化加氢制得了几种4-酮,1 H,4,5-二氢-1,2,5-苯并三氮杂pine研究1,2,5-苯并三氮杂((XI)并与温热
盐酸反应。氢化会在位置1和2之间产生7元环的裂变,用酸加热会产生环收缩,从而生成XI的异构体。该异构体的结构为
1-甲基-2-酮-4-亚
氨基-1,2-二氢
喹喔啉(XXV)。