Dimethyl Sulfoxide Mediated Elimination Reactions in 3-Aryl 2,3-Dihalopropanoates: Scope and Mechanistic Insights
作者:Wei Li、Jianchang Li、Melissa Lin、Sumrit Wacharasindhu、Keiko Tabei、Tarek S. Mansour
DOI:10.1021/jo070217c
日期:2007.8.1
Dimethyl sulfoxide (DMSO) efficiently causes the reductive elimination of 3-aryl 2,3-dibromopropanoates to cinnamates with good yield. With 3-phenyl 2,3-dihalopropanoates, debromination is the major pathway providing 3-phenylacrylate derivatives in high yields, whereas dehydrobromination is a competing pathway with thiophene derivatives. 1H NMR, 81Br NMR, and MS techniques indicated the formation of
二甲基亚砜(DMSO)有效地导致3-芳基2,3-二溴丙酸酯的还原消除为肉桂酸酯,收率良好。对于3-苯基2,3-二卤代丙酸酯,脱溴是提供高收率的3-苯基丙烯酸酯衍生物的主要途径,而脱氢溴化是与噻吩衍生物竞争的途径。1 H NMR,81 Br NMR和MS技术表明,在该转化过程中形成了副产物溴化DMSO,MeBr和HBr,没有证据表明形成了Br 2。DMSO作为亲核试剂和溴清除剂的双重作用解释了该反应中形成的产物。