Practical Modifications and Applications of the Sharpless Asymmetric Aminohydroxylation in the One-Pot Preparation of Chiral Oxazolidin-2-ones
作者:Nancy S. Barta、Daniel R. Sidler、Kara B. Somerville、Steven A. Weissman、Robert D. Larsen、Paul J. Reider
DOI:10.1021/ol006255z
日期:2000.9.1
This communication focuses on a convenient, practical one-pot preparation of chiral 4,5-disubstituted oxazolidan-2-ones in good yield with high enantioselectivities, using a modified Sharpless asymmetric aminohydroxylation of beta-substituted styrene derivatives followed by base-mediated ring closure. This procedure has been demonstrated on both small and large scale, utilizing 1, 3-dichloro-5,5-dimethyl
[反应:见正文]手性恶唑烷-2-酮在手性助剂方面具有合成价值,并且许多具有药学上令人关注的生物学活性。该交流侧重于方便,实用的一锅法制备高收率,高对映选择性的手性4,5-二取代的oxazolidan-2-ones,方法是使用改良的Sharpless不对称氨基羟基化β-取代的苯乙烯衍生物,然后进行碱介导的闭环。已经使用1,3-二氯-5,5-二甲基乙内酰脲作为次氯酸叔丁酯的易于处理的市售替代品在小规模和大规模上证明了该方法。