Regioselective synthesis of poly-substituted thiophenes from Baylis–Hillman adducts
作者:Hyun Seung Lee、Se Hee Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2009.09.012
日期:2009.11
The reaction of Baylis–Hillman acetates and ethyl mercaptoacetate in the presence of DBU in DMF produced 2,3,4-trisubstituted tetrahydrothiophenes at room temperature as a diastereomeric mixture via the sequential SN2′ and Michael addition. Aromatization of tetrahydrothiophenes by DDQ oxidation produced 2,3,4-trisubstituted thiophenes in good yields.
在DBU中,在DBU中,Baylis–Hillman乙酸盐和巯基乙酸乙酯的反应通过连续的S N 2'和Michael加成反应,在室温下生成2,3,4-三取代的四氢噻吩,为非对映异构体混合物。通过DDQ氧化对四氢噻吩进行芳香化处理,可得到高产率的2,3,4-三取代噻吩。