Dubey AK, Chowdhury R. Solvent-free synthesis of enantioenriched β-silyl nitroalkanes under organocatalytic conditions.
Beilstein J Org Chem 2021;
17:2642-2649. [PMID:
34795801 PMCID:
PMC8561140 DOI:
10.3762/bjoc.17.177]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 10/13/2021] [Indexed: 12/22/2022] Open
Abstract
An enantioselective 1,4-conjugate addition of nitromethane to β-silyl α,β-unsaturated carbonyl compounds catalyzed by bifunctional squaramide catalysts has been developed. This methodology offers both enantiomers of β-silyl nitroalkanes in good to excellent yields (up to 92%) and enantioselectivities (up to 97.5% ee) under solvent-free conditions at room temperature. Control experiments reveal that the presence of a β-silyl group in the enones is crucial for high reactivity under the optimized reaction conditions.
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