Regioselective Synthesis of 5-Alkylthio- and 3-Alkylthioisoxazoles from Acylketene Dithioacetals
作者:M. L. Purkayastha、H. Ila、H. Junjappa
DOI:10.1055/s-1989-27133
日期:——
A regioselective synthesis of isomeric 5-alkylthio- and 3-alkylthioisoxazoles 3 and 4 has been developed from acylketene dithioacetals 2. Thus the reaction of 2a-l with hydroxylamine hydrochloride in the presence of sodium methoxide in refluxing methanol afforded 3-substituted 5-alkylthioisoxazoles 3a-l in good yields. When compounds 2a-l were reacted with hydroxylamine hydrochloride in the presence of sodium acetate/acetic acid (pH 2.2) in refluxing ethanol/benzene, 3-alkylthioisoxazoles 4a-l were obtained regioselectively in good yields. Mass-spectral fragmentation and the mechanism of the formation of 3 and 4 are discussed.
从酰基乙烯二硫代乙醛 2 发展出了异构的 5-烷硫基和 3-烷硫基异噁唑 3 和 4 的区域选择性合成方法。因此,在甲醇回流中,在甲醇钠存在下,2a-l 与盐酸羟胺反应,可以得到 3-取代的 5-烷基硫代异噁唑 3a-l,收率很高。当化合物 2a-l 与盐酸羟胺在乙酸钠/乙酸(pH 2.2)存在下于回流乙醇/苯中反应时,3-烷基硫代异噁唑 4a-l 以良好的产率被选择性地得到。本文讨论了 3 和 4 的质谱碎片和形成机理。