Juliá–Colonna stereoselective epoxidation of some α,β-unsaturated enones possessing a stereogenic centre at the γ-position: synthesis of a protected galactonic acid derivative
作者:Peter C. Ray、Stanley M. Roberts
DOI:10.1039/b007100p
日期:——
The oxidation of enones 6â8 using peroxide or percarbonate and polyleucines as catalysts gave the corresponding diastereomers 9â12 in high yield. The compound 9 was converted into the galactonic acid derivative 16 in five steps and in an overall yield of nearly 60%. Polyleucines are shown to be catalysts powerful enough to overturn the intrinsic stereocontrol in the chosen substrates.
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使用过氧化物或过碳酸盐和聚亮氨酸作为催化剂氧化烯酮 6â8 后,可以得到相应的非对映异构体 9â12 ,收率很高。化合物 9 通过五个步骤转化为半乳糖酸衍生物 16,总产率接近 60%。事实证明,多亮氨酸是一种催化剂,其催化作用足以推翻所选底物中固有的立体控制。