Derivatives of 2,3-dihydroimidazo[1,5,4-<i>ef</i>][1,2,5]-benzothiadiazepin-6(4<i>h</i>,7<i>h</i>)-thione 1,1-dioxide, a new heterocyclic system related to tibo
作者:Roberta Costi、Roberto Di Santo、Marino Artico、Silvio Massa
DOI:10.1002/jhet.5570390111
日期:2002.1
starting from N-substituted ethyl 2-(5-chloro-2-nitrobenzenesulfonamido)-2-alkyl-acetates. Fundamental steps of the synthetic pathway were: i) intramolecular cyclization of N-substituted 2-(2-amino-5-chlorobenzenesulfonamido)-2-alkylacetic acids in the presence of N-(3-dimethyl-aminopropyl)-N′-ethyl carbodiimide hydrochloride-N,N-dimethylaminopyridine complex; ii) building of imidazole ring from 2-alkyl-8-chloro-2
据报道,从N-取代开始,合成了2,3-二氢咪唑并[1,5,4- ef ] [1,2,5]苯并噻二氮杂-6-6 (4 H,7 H)-硫酮1,1-二氧化物的衍生物2-(5-氯-2-硝基苯磺酰胺基)-2-烷基-乙酸乙酯。该合成途径的基本步骤是:ⅰ)的分子内环化ñ -取代的2-(2-氨基-5- chlorobenzenesulfonamido)在存在-2- alkylacetic酸ñ - (3-二甲基氨基丙基) - N' -乙基碳二亚胺盐酸盐-N,N-二甲基氨基吡啶配合物;ii)由2-烷基-8-氯-2,3-二氢-3-甲基-1,2,5-苯并噻二氮杂-4(5 H)-1,1-二氧化物获得2-烷基-9-氯-2,3-二氢-3-甲基咪唑并[1,5,4- ef ] [1,2,5]苯并噻二氮杂-6(4 H, 7 H)-1,1-二氧化物;iii)通过用Lawesson试剂处理来制备硫代羰基衍生物。在咪唑并苯并噻二氮