Ryczkowska M, Trocka A, Hromova A, Makowiec S. Meldrum's acid assisted formation of tetrahydroquinolin-2-one derivatives a short synthetic pathway to the biologically useful scaffold.
Sci Rep 2024;
14:487. [PMID:
38177152 PMCID:
PMC10766601 DOI:
10.1038/s41598-023-50535-0]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 12/21/2023] [Indexed: 01/06/2024] Open
Abstract
A new method for the preparation of tetrahydroquinolin-2-one derivatives is presented. This approach involves a two-step reaction between enaminones and acylating agents, immediately followed by electrophilic cyclization, all within a single synthesis procedure, eliminating the need to isolate intermediates. The entire process is facilitated by the use of acyl Meldrum's acids which not only shortens the preparation time of the substrates but also easily extends the range of substituents That can be used. The method's scope and limitations were evaluated with various reagent combinations thus demonstrating its general applicability to the synthesis of tetrahydroquinolin-2-one core. Interestingly, some exceptions to the regular reaction pathway were observed when a strong EDG (electron donating group) was introduced via acyl Meldrum's acids. The underlying mechanism of this phenomenon was elucidated during the investigation.
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