Formate ester synthesis via reaction of 2-bromoethylamines with dimethylformamide
作者:Marianna Dakanali、George K. Tsikalas、Harald Krautscheid、Haralambos E. Katerinopoulos
DOI:10.1016/j.tetlet.2008.01.002
日期:2008.3
2-Bromoethylamines are converted to the corresponding formate esters in the presence of DMF. Both primary and secondary bromides are smoothly transformed to the esters in satisfactory yields. The reaction mechanism involves the formation of an aziridinium ion, which upon reaction with DMF forms a Vilsmeier-type intermediate that is further hydrolyzed to the corresponding formates. Participation of
在DMF存在下,将2-溴乙胺转化为相应的甲酸酯。伯溴化物和仲溴化物都可以令人满意的收率平稳地转化为酯。该反应机理涉及形成氮杂环丁烷离子,该氮杂环丁烷离子与DMF反应形成Vilsmeier型中间体,该中间体进一步水解成相应的甲酸酯。β-氨基的参与似乎不仅控制反应的区域选择性,而且控制反应的立体选择性。将反应条件应用于手性底物表明形成了未重排的产物,并在反应中心保留了构型。