Majdecki M, Grodek P, Jurczak J. Stereoselective α-Chlorination of β-Keto Esters in the Presence of Hybrid Amide-Based
Cinchona Alkaloids as Catalysts.
J Org Chem 2021;
86:995-1001. [PMID:
33320665 PMCID:
PMC7872425 DOI:
10.1021/acs.joc.0c02486]
[Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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We
report an enantioselective phase transfer α-chlorination
of β-keto esters catalyzed by hybrid amide-based Cinchona derivatives. The chlorination process proceeds
with proper quantitative yields (up to <99%) and high asymmetric
induction (up to 97% ee). We show that the use of only 0.5 mol % hybrid
catalyst based on a Cinchona core allows
the chlorination reaction to be conducted in a highly enantioselective
manner with various indanone and tetralone carboxylate esters.
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