A simple two-step synthesis of 2-(alkylamino)-1-arylethanols, including racemic adrenaline, from aromatic aldehydes via 5-aryloxazolidines
作者:Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tetlet.2013.08.083
日期:2013.10
Benzaldehydes react smoothly with nonstabilized azomethine ylides, generated in situ from sarcosine/formaldehyde or N-(methoxymethyl)-N-(trimethylsilylmethyl)benzylamine, to give 5-aryloxazolidines as intermediates. These were converted into 2-(alkylamino)-1-arylethanols in good yields by simple heating in methanol with hydrochloric acid, or by treatment with hydrazine hydrate in ethanol.
苯甲醛与由肌氨酸/甲醛或N-(甲氧基甲基)-N-(三甲基甲硅烷基甲基)苄胺原位生成的不稳定的甲亚胺基化物平稳反应,生成5-芳基恶唑烷作为中间体。通过简单地在甲醇中用盐酸加热,或通过在乙醇中用水合肼处理,将它们高产率地转化为2-(烷基氨基)-1-芳基乙醇。