Gabrielli S, Giardinieri A, Sampaolesi S, Ballini R, Palmieri A. A New One-Pot Synthesis of Quinoline-2-carboxylates under Heterogeneous Conditions.
Molecules 2016;
21:molecules21060776. [PMID:
27314321 PMCID:
PMC6273069 DOI:
10.3390/molecules21060776]
[Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 06/07/2016] [Accepted: 06/08/2016] [Indexed: 12/02/2022] Open
Abstract
Quinoline-2-carboxylates are an important subclass of quinoline derivatives largely present in a variety of biologically active molecules, as well as useful ligands in metal-catalyzed reactions. Herein, we present a new one-pot protocol for synthesizing this class of derivatives starting from β-nitroacrylates and 2-aminobenzaldehydes. In order to optimize the protocol, we investigated several reaction conditions, obtaining the best results using the 2-tert-Butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazaphosphorine (BEMP) as solid base, in acetonitrile. Finally, we demonstrated the generality of our approach over several substrates which led to synthesize a plethora of functionalized quinolines-2-carboxylate derivatives in good overall yields.
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