Ma H, Feng J, Zhou W, Chen C, Deng Z, Zhou F, Ouyang Y, Zhang X, Cai Q. Copper(i)-catalyzed asymmetric intramolecular C-arylation with ureas as the additives: highly enantioselective formation of spirooxindoles.
Org Biomol Chem 2021;
19:7480-7484. [PMID:
34612367 DOI:
10.1039/d1ob01327k]
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Abstract
A cooperative catalytic strategy is developed for a copper-catalyzed asymmetric intramolecular C-arylation reaction with ureas as the co-catalysts. By forming hydrogen bonds with 1,3-dicarbonyl structures, ureas can activate the substrates, stabilize the carbanion intermediates and the products, and fix the syn-configurations of 1,3-dicarbonyl structures. They help enhance the reactivity, prevent side reactions and improve the enantioselectivities.
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