C3??Symmetric Cinchonine??Squaramide??Catalyzed Asymmetric Chlorolactonization of Styrene??Type Carboxylic Acids with 1, 3??Dichloro??5, 5??dimethylhydantoin: An …
X Han, C Dong, HB Zhou
Index: Han, Xin; Dong, Chune; Zhou, Hai-Bing Advanced Synthesis and Catalysis, 2014 , vol. 356, # 6 p. 1275 - 1280
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Citation Number: 20
Abstract
Abstract: A more practical and efficient catalytic asymmetric chlorolactonization of styrene- type carboxylic acids with 1, 3-dichloro-5, 5-dimethylhydantoin (DCDMH) using C3- symmetric cinchoninesquaramide (CSCS) as organocatalyst has been developed. A series of chiral chloro-substituted isochroman-1-ones was obtained in excellent yields (up to 95%) and enantioselectivities (up to 99% ee), whwereby the results for chloro-substituted ...
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