Murayama T, Shibuya M, Yamamoto Y. Divergent Synthesis of Polymethoxylated 4-Aryl-2-quinolones.
J Org Chem 2016;
81:11940-11949. [PMID:
27934456 DOI:
10.1021/acs.joc.6b02626]
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Abstract
Polymethoxylated 4-aryl-2-quinolones were synthesized from the corresponding (o-aminophenyl)propiolates via Cu-catalyzed hydroarylation and subsequent deprotection/lactam formation. Selective iodination of the C3 position of the product followed by coupling reactions of the resulting 3-iodinated 4-aryl-2-quinolone afforded 3-substituted-4-aryl-2-quinolones. Moreover, the N-benzyl protecting group was successfully replaced with other polyoxygenated benzyl groups.
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