Another alternate approach based on the cyclodehydration of the ureic compounds (IV) was unsuccessful. The synthesis of I was accomplished by methylation of the 1,2,3,4-tetrahydro-5H-5-thioxo-1,4-benzodiazepine (VI) with dimethyl sulfate in methanol-dioxane. Another attempted method for the synthesis of I is also presented. J. Heterocyclic Chem., 14, 985 (1977)
许多5-
氨基-2,3-二氢-1- ħ(II)-1,4-苯二氮已经从5-甲
硫基-2,3-二氢- 1的反应制备ħ -1,4-苯并二氮杂( I)与
胺类。基于
尿酸化合物(IV)的环脱
水的另一种替代方法是不成功的。通过在
甲醇-
二恶烷中用
硫酸二甲酯使1,2,3,4-四氢-5 H -5-
硫代-1,4-苯并二氮杂(VI)甲基化来完成I的合成。还提出了另一种尝试合成I的方法。J.杂环化学。,14,985(1977)