Synthesis of Triazolyl-Oxadiazolyl-Thiazolyl- and Thiadiazolylbenzofuran of Potential Biological Activity
作者:S. M. S. Atta、N. M. Fawzy、F. A. Ahmed、A. H. Abdel-Rahman
DOI:10.1080/10426500210654
日期:2002.4.1
6-hydroxybenzofuran-5-carbohydrazide were reacted with aryl or alkyl isothiocyanates to give the corresponding thiosemicarbazides ( IIa-h ). Cyclization of the substituted thiosemicarbazides with sodium hydroxide led to the formation of 1,3,4-triazol-2-yl-benzofuran derivatives ( IIIa-d ). Desulfurization of thiosemicarbazide by mercuric oxide gave 1,3,4-oxadiazolyl-benzofuran ( IVa-c ). Treatment of
4,7-二甲氧基 (Ia) 和 4-甲氧基 (Ib) 6-羟基苯并呋喃-5-碳酰肼与异硫氰酸芳基或烷基酯反应得到相应的氨基硫脲 (IIa-h)。取代氨基硫脲与氢氧化钠的环化导致形成 1,3,4-三唑-2-基-苯并呋喃衍生物 (IIIa-d)。通过氧化汞对氨基硫脲脱硫得到 1,3,4-恶二唑基-苯并呋喃 (IVa-c)。氨基硫脲用溴-乙酸乙酯或f-溴丙酸处理产生4-噻唑啉-2-基-羰基-苯并呋喃(Va-h)。化合物IIb、e、f与硫酸或磷酰氯的反应得到1,3,4-噻二唑-2-基-苯并呋喃(VIa-d,VII)。