作者:F. Duus
DOI:10.1016/0040-4020(76)80129-9
日期:1976.1
with H2S in acidic ethanol to give 2,5- or higher substituted thiophens as resulting from a spontaneous ring-closure reaction of initially formed sulphur analogues of the starting diketones. In some the corresponding 2-mercapto-2,3-dihydrothiophens and/or 2,5-dimercaptotetrahydrothiophens were formed as by-products. 1,4-Diphenyl-1,4-diketones behaved exceptionally under similar reaction conditions yielding
各种1,4-二酮和2-乙氧基羰基-1,4-二酮已与H 2 S在酸性乙醇中反应,生成2,5-或更高取代的噻吩,这是由于最初形成的硫类似物的自发闭环反应所致起始二酮。在一些副产物中形成了相应的2-巯基-2,3-二氢噻吩和/或2,5-二巯基四氢噻吩。1,4-二苯基-1,4-二酮在相似的反应条件下表现异常,优先产生2,5-二苯基呋喃。