Heterocycles with a Benzothiadiazeypine Moiety. I. Synthesis of Pyrrolo[1,2-b]-<i>s</i>-triazolo[3,4-d] [1,2,5]benzothiadiazepine 5,5-Dioxide
作者:Marino Artico、Romano Silvestri、Giorgio Stefancich
DOI:10.1080/00397919208021610
日期:1992.5
Abstract Condensation of 2-nitrobenzenesulfonyl chloride with 2-ethoxycarbonyl-1H-pyrrole in the presence of potassium tert-butoxide and 18-crown-6 furnished 2-ethoxycarbonyl-1-(2-nitrobenzenesulfonyl)-1H-pyrrole. Reduction of nitro group to amino and subsequent cyclization by heating the aminoester in the presence of 2-hydroxypyridine as a bifuctional catalyst led to 11-oxo(10H)-pyrrolo[1,2-b] [1,2,5]benzothiadiazepine
摘要 2-硝基苯磺酰氯与2-乙氧基羰基-1H-吡咯在叔丁醇钾和18-冠-6存在下缩合得到2-乙氧基羰基-1-(2-硝基苯磺酰基)-1H-吡咯。在作为双功能催化剂的 2-羟基吡啶存在下,通过加热氨基酯将硝基还原为氨基并随后环化生成 11-氧代 (10H)-吡咯并 [1,2-b] [1,2,5] 苯并噻二氮杂 5 ,5-二氧化物。后一化合物用二-4-吗啉基次膦酰氯处理得到相应的次膦酰氧基亚胺,其与甲酰肼反应后发生分子内环化,得到标题四环。