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
描述了1,3,4-苯并三氮杂-2,5-二酮2a及其2-硫代类似物11的合成。关键步骤是邻-(氨基苯甲酰基)肼10的温和有效环化,这是由受保护的肼衍生物与邻硝基苯甲酰氯3反应制得的。2a的烷基化仅在N -3发生,而11的烷基化在硫上发生。邻-(氨基苯甲酰基)肼14的环化得到2,4(1 H,3 H)-喹唑啉二酮15作为唯一产物。