Efficiency of alkoxyl radical product formation from 5-substituted 3-alkoxy-4-methylthiazole-2(3H)-thiones
作者:Jens Hartung、Christine Schur、Irina Kempter、Thomas Gottwald
DOI:10.1016/j.tet.2009.11.113
日期:2010.2
In a comparative study, reactions between 5-(p-methoxyphenyl)-substituted 3-alkoxy-4-methylthiazole-2(3H)-thiones and appropriate mediators (BrCCl3, Bu3SnH) provided higher yields of alkoxyl radical products (δ-bromohydrins, cyclic ethers, carbonyl compounds) than respective transformations of 5-phenyl- and 5-methyl-substituted derivatives. The unusual selectivity of applied thiohydroxamates to furnish
在一项比较研究中,由5-(对甲氧基苯基)取代的3-烷氧基-4-甲基噻唑-2(3 H)-硫酮与适当的介体(BrCCl 3,Bu 3 SnH )之间的反应提供了更高产率的烷氧基自由基产物( δ-溴代醇,环醚,羰基化合物)分别取代了5-苯基和5-甲基取代的衍生物。即使使用软碳亲电试剂处理,硫代异羟肟酸酯提供O-烷基化产物的选择性也很差,而且3-烷氧基-5-(对甲氧基苯基)-4-甲基噻唑-2(3 H)的显着倾向硫酮结晶,以值得注意的方式促进了新的烷氧基自由基前体家族的制备和纯化。