A Synthesis of 4-Quinolone-3-carboxylic Acids via Pyrolysis of N-Aryldioxopyrrolines
摘要:
A synthesis of 4-quinolone-3-carboxylic acids (8) was achieved by pyrolysis of 4,5-dimethoxycarbonyl-1-aryl-1H-pyrrole-2,3-diones (3) followed by selective demethoxycarbonylation of the resulting 2,3-dimethoxycarbonyl-4-quinolones (4) in excellent overall yields.
A Synthesis of 4-Quinolone-3-carboxylic Acids via Pyrolysis of N-Aryldioxopyrrolines
摘要:
A synthesis of 4-quinolone-3-carboxylic acids (8) was achieved by pyrolysis of 4,5-dimethoxycarbonyl-1-aryl-1H-pyrrole-2,3-diones (3) followed by selective demethoxycarbonylation of the resulting 2,3-dimethoxycarbonyl-4-quinolones (4) in excellent overall yields.
Synthesis of 4-hydroxyquinoline-2,3-dicarboxylates using N-(2-aminobenzoyl)benzotriazoles
作者:İlhami Çelik、Fatoş Yıldız
DOI:10.1016/j.tet.2017.05.058
日期:2017.7
A method for the preparation of 4-hydroxyquinoline-2,3-dicarboxylates has been developed by aza-Michael addition reaction of N-(2-aminobenzoyl)benzotriazoles with dimethyl acetylenedicarboxylate. 4-Hydroxyquinoline-2,3-dicarboxylates were obtained in moderate to good yields (53–87%).
An efficient transition-metal-free oxidative cyclization reaction using isatins and alkynes for the facile synthesis of structurally diverse 4-quinolones has been developed. Intriguingly, switchable access to substituted 3-carboxylate-4-quinolones and 1-vinyl-3-carboxylate-4-quinolones could be achieved by choosing a different base in the reaction. The obtained products could undergo further transformations, increasing the application potential of the method in organic synthesis.