Asymmetric Hydroxylation of 4-Substituted Pyrazolones Catalyzed by Natural <i>Cinchona</i>
Alkaloids
作者:Fuzhao Xue、Xiaoze Bao、Liwei Zou、Jingping Qu、Baomin Wang
DOI:10.1002/adsc.201601070
日期:2016.12.22
A natural quinine‐catalyzed, efficient and practical asymmetric α‐hydroxylation of 4‐substituted pyrazolones has been developed, delivering a broad spectrum of pyrazolones bearing an oxygen‐attached carbon stereocenter at C‐4 in high yields and excellent enantioselectivities. The broad substrate scope, ready availability of the catalyst, ease of operation, and valuable transformation of the product
已开发出一种天然的奎宁催化,高效且实用的4-取代吡唑啉酮不对称α-羟基化反应,可提供广谱的吡唑啉酮,其在C-4处带有氧连接的碳立体中心,且收率高且对映选择性极好。广泛的底物范围,容易获得的催化剂,易于操作以及有价值的产物转化突出了该方法的实用性。