Synthesis and alkylation of 3,4-dihydro-1<i>H</i>-1,3-4-benzotriazepine-2,5-diones and related systems
作者:Gary M. Karp
DOI:10.1002/jhet.5570330421
日期:1996.7
A synthesis of the 1,3,4-benzotriazepine-2,5-dione 2a and its 2-thio analog 11 is described. The key step was the mild and efficient cyclization of the o-(aminobenzoyl)hydrazine 10, obtained from the reaction of a protected hydrazine derivative with the o-nitrobenzoyl chloride 3. Alkylation of 2a takes place exclusively at N-3 while alkylation of 11 takes place on sulfur. Cyclization of the o-(aminobenzoyl)hydrazine