Synthesis of some thiazolyl and thiadiazolyl derivatives of substituted furan and pyrrole
作者:Seham Y. Hassan
DOI:10.1002/jhet.5570440104
日期:2007.1
Four series of substituted furan and pyrrole have been synthesized. The first series was prepared by cyclization of the key intermediates ethyl 5-[(4-substituted thiosemicarbazido)methyl]-2-methylfuran-3-carboxylates 2a-2d and 1-[(4-acetyl-5-methyl-1H-pyrrol-2-yl)methylene]-4-substituted thiosemicarbazides 8a-8d with chloroacetic acid or (ethyl bromoacetate) to afford the corresponding 4-oxo-3-substituted
合成了四个系列的呋喃和吡咯。第一系列的制备是通过将关键中间体环化5 - [(4-取代的氨基硫脲)甲基] -2-甲基呋喃-3-羧酸酯2A-2D和1 - [(4-乙酰基-5-甲基-1- ħ -氯乙酸或(溴乙酸乙酯)吡咯-2-基)亚甲基] -4-取代的硫代氨基脲8a-8d,得到相应的4-氧-3-取代的噻唑烷-2-亚甲基3a-3d或3-取代的噻唑烷-4 -一个9a-9d。在另一方面,中间体的加热2A-2D或图8A-8D与得到相应的(乙酸酐Ñ-取代的乙酰氨基)-2,3-二氢-[1,3,4]噻二唑-2-基衍生物4a-4d和[1,3,4]噻二唑-2-基-N-取代乙酰胺10a-10d,而用对-溴苯甲酰基溴环化分别产生相应的3-取代的噻唑-2-基亚烷基5a-5d和11a-11d。此外,通过中间体2a-2d或8a-的反应,获得了4-氧代-3-取代的硫脲基-噻唑烷-2-基6-a-6d或4-氧代噻唑烷-3-基-3