A Practical and Efficient Synthesis of Enantiomerically Pure Di-tert-butyl-ethanediamine
作者:Sylvain Roland、Pierre Mangeney、Alex Alexakis
DOI:10.1055/s-1999-3391
日期:1999.2
A diastereoselective synthesis of 1,2-diamino-1,2-di-tert-butylethane has been developed by addition of tert-butyl magnesium chloride to a chiral bis-imine derived from glyoxal and (S)-methylbenzylamine. Addition of the bis-imine to the Grignard reagent in hexane at 50 °C gave only one diastereomer detectable by 1H and 13C NMR. Hydrogenolysis of the phenylethyl groups led to the expected free diamine 3 in good yields. The absolute configuration (R,R) of the carbons bearing the tert-butyl groups has been confirmed by X-ray spectroscopy.
通过将叔丁基氯化镁加到乙二醛和 (S)- 甲基苄胺衍生的手性双亚胺中,开发出了一种非对映选择性合成 1,2- 二氨基-1,2-二叔丁基乙烷的方法。在 50 °C、己烷中将双亚胺加入格氏试剂后,只能通过 1H 和 13C NMR 检测到一种非对映异构体。苯乙基基团的氢解反应产生了预期的游离二胺 3,收率很高。带有叔丁基的碳的绝对构型 (R,R) 已通过 X 射线光谱得到证实。