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Highly enantioselective asymmetric Henry reaction catalyzed by novel chiral phase transfer catalysts derived from cinchona alkaloids†
Ponmuthu Kottala Vijaya,Sepperumal Murugesan,Ayyanar Siva
Organic & Biomolecular Chemistry Pub Date : 10/04/2016 00:00:00 , DOI:10.1039/C6OB01687A
Abstract

A new type of di-site chiral phase transfer catalyst has been designed and synthesized from cinchona alkaloids as a chiral precursor. The prepared catalysts are applied in the asymmetric Henry reaction to a wide range of aldehydes using mild concentrations of a base and solvent and under room-temperature conditions. Under the optimized reaction conditions, the highest chemical yields up to 99% along with an excellent enantiomeric excess (ee) up to 99% were obtained using the prepared cinchona alkaloid based chiral phase transfer catalysts.

Graphical abstract: Highly enantioselective asymmetric Henry reaction catalyzed by novel chiral phase transfer catalysts derived from cinchona alkaloids
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