Bifunctional organocatalysis with squaramide-containing Dawson organo-polyoxotungstates | Zendy

David Lachkar | Zendy; Emmanuel Lacôte | Zendy

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Bifunctional organocatalysis with squaramide-containing Dawson organo-polyoxotungstates

Author(s) -

David Lachkar,

Emmanuel Lacôte

Publication year - 2015

Publication title -

comptes rendus chimie

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.653

H-Index - 76

eISSN - 1878-1543

pISSN - 1631-0748

DOI - 10.1016/j.crci.2015.05.006

Subject(s) - squaramide , bifunctional , chemistry , catalysis , organocatalysis , base (topology) , nucleophile , organic chemistry , enantioselective synthesis , mathematical analysis , mathematics

Two squaramide-containing organo-polyoxometalates (POMs) have been prepared, which efficiently catalyze the addition of dicarbonyl derivatives onto nitroolefins. The POM surface enhances the reactivity of the squaramide, and the hybrid acts as a bifunctional catalyst, where the highly charged POM surface in the organic medium is a base, which deprotonates the nucleophile and the squaramide activates the nitroalkenes via H-bonds. This opens new perspectives to POM-based catalysis

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