Efficient synthesis of 4-oxo-4,5-dihydrothieno[3,2-c]quinoline-2-carboxylic acid derivatives from aniline.
Mol Divers 2013;
18:51-9. [PMID:
24026508 DOI:
10.1007/s11030-013-9476-4]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 08/19/2013] [Indexed: 10/26/2022]
Abstract
The first reported synthesis of potential kinase inhibitors, 4-oxo-4,5-dihydrothieno[3,2-c]quinoline-2-carboxylic acid derivatives starting from aniline is described. This efficient high yielding sequence was carried out in six steps without any chromatographic purification. A tandem nucleophilic aromatic substitution/cyclization reaction was used as a key step in the sequence. The versatile intermediate 2-carboxylic acid was used as a suitable precursor to access the functionalization of the C-ring, by convergent analog synthesis of several novel derivatives.
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