Alkylation of 5-(3-chlorobenzo[b]thien-2-yl)-1,2,4-triazole-3-thione with Epichlorhydrin and the Role of MW and Solid Support in the Reaction
作者:Nadjet Rezki、Mohamed Aouad、Mouslim Messali、El El Ashry
DOI:10.2174/1570178612666150331204431
日期:2015.6.4
An efficient eco-friendly approach has been adopted for the selective synthesis of 2,3-
epoxypropylsulfanyltriazole 4 from the reaction of 1-chloro-2,3-epoxy-propane (2) with 5-(3-
chlorobenzo[b]thien-2-yl)-4H-1,2,4-triazole-3-thione (1) under solvent free microwave conditions in the presence of a
solid support. Instead, when the mixture of reactants was irradiated for prolonged time in the absence of solid support, triazolo[
2,1-b]thiazine 3 was exclusively afforded in excellent yield. On the other hand, performing the irradiation in the
presence of a base, mixtures of compounds 4 and 3 were obtained; the ratio of the two products was dependent on the nature
of the base, although 4 was the major product in each case.
在无溶剂微波条件下,在固体载体存在的情况下,通过1-氯-2,3-环氧丙烷(2)与5-(3-氯苯并[b]噻吩-2-基)-4H-1,2,4-三唑-3-硫酮(1)的反应,采用一种有效的环保方法选择性合成2,3-环氧丙基硫代三唑4。相反,在没有固体载体的情况下,当反应物的混合物长时间照射时,三唑并[2,1-b]噻嗪3的产量极高。另一方面,在碱的存在下进行照射,则可获得化合物4和3的混合物;两种产物的比例取决于碱的性质,尽管4是每种情况下的主要产物。