We report a multi-component asymmetric Brønsted acid-catalyzed aza-Darzens reaction which is not limited to specific aromatic or heterocyclic aldehydes. Incorporating alkyl diazoacetates and, important for high ee's, ortho-tert-butoxyaniline our optimized reaction (i.e. solvent, temperature and catalyst study) affords excellent yields (61-98 %) and mostly >90 % optically active cis-aziridines. (+)-Chloramphenicol
我们报告了多组分不对称布朗斯台德酸催化的aza-Darzens反应,该反应不限于特定的芳族或杂环醛。掺入重氮烷基
乙酸酯和对高ee值很重要的邻叔
丁氧基苯胺,我们优化的反应(即溶剂,温度和催化剂研究)可提供优异的收率(61-98%),并且大部分是> 90%的光学活性顺式
氮丙啶。(+)-
氯霉素是由市售起始原料分4步产生的。概述了一种尝试性机制。