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A novel cinchonine catalyst supported by carboxymethylcellulose (CMC) has been prepared with a simple approach. As-prepared CMC-supported cinchonine catalyst was used to catalyze the asymmetric Michael addition of 1,3-dicarbonyl compounds to N-benzylmaleimide at a very low loading (3 mol%). It has been found that desired adducts containing adjacent quaternary and tertiary stereocenters can be obtained...
A series of polymer-bound cinchona alkaloids has been prepared. The resultant polymer-bound cinchona alkaloids have been used as the catalysts for the asymmetric Michael reaction of 1,3-dicarbonyl compounds and N-benzylmaleimide. The corresponding asymmetric Michael addition product, the first example of adjacent quaternary and tertiary stereocenters synthesized in the presence of a polymer-bound...
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