Reactions with hydrazidoyl halides.<b>IV</b>. Synthesis of thiazolo[3,2-<i>a</i>]benzimidazoles, imidazo[2,1-6]thiazoles and pyrazolo[4,3-<i>b</i>]thiazines
作者:Abdou O. Abdelhamid、Fawzy A. Attaby
DOI:10.1002/jhet.5570280107
日期:1991.1
Hydrazidoyl halides were condensed with 2-mercaptobenzimidazole yielding 4a-c and 7a,b which were cyclized to the corresponding 2-arylhydrazonothiazolo[3,2-a]benzimidazol-3-ones 5a,b and 3-substituted 2-arylazo thiazolo[3,2-a]benzimidazoles 8a,b respectively. Imidazo[2,1-b]thiazoles were obtained by the reaction of hydrazidoyl halides with 2-mercapto-4,5-dihydroimidazole. Also, hydrazidoyl halides
将酰肼基卤化物与2-巯基苯并咪唑缩合,得到4a-c和7a,b,将其环化为相应的2-芳基肼基没杂唑[ 3,2 - a ]苯并咪唑-3-酮5a,b和3-取代的2-芳基偶氮噻唑[3 ,2- a ]苯并咪唑分别为8a,b。通过酰肼基卤化物与2-巯基-4,5-二氢咪唑的反应获得咪唑并[ 2,1- b ]噻唑。另外,使酰肼基卤化物6a,b与3-氨基-4-巯基-5-苯基吡唑反应,得到吡唑并[4,3- b ]噻嗪15a,b。。根据产品的元素分析和光谱数据确定产品的结构。