Synthesis of 2,3-Fused Quinolines from 3-Substituted Quinoline 1-Oxides. Part III. Intramolecular Cyclization of Quinoline 1-Oxides Bearing Active Methylene Groups at the 3-Position in the Presence of Acetic Anhydride
摘要:
3-N-Alkylcyanoacetamidoquinoline 1-oxides (3a and 3c) react with Ac2O at room temperature in chloroform to afford 1-alkyl-3-cyano-4H-pyrrolo[3,2-b]quinolin-2-ones (4a and 4c). The cyclization of 3-N-alkylethoxycarbonylacetamidoquinoline 1-oxides (3b and 3d) occurs upon heating with Ac2O at 60-degrees-C. 3-(3,3-Dicyanopropoxy) quinoline 1-oxide (5) also cyclizes to the pyranoquinoline (6) when treated with Ac2O at room temperature in chloroform-DMF.
Synthesis of 2,3-Fused Quinolines from 3-Substituted Quinoline 1-Oxides. Part III. Intramolecular Cyclization of Quinoline 1-Oxides Bearing Active Methylene Groups at the 3-Position in the Presence of Acetic Anhydride
摘要:
3-N-Alkylcyanoacetamidoquinoline 1-oxides (3a and 3c) react with Ac2O at room temperature in chloroform to afford 1-alkyl-3-cyano-4H-pyrrolo[3,2-b]quinolin-2-ones (4a and 4c). The cyclization of 3-N-alkylethoxycarbonylacetamidoquinoline 1-oxides (3b and 3d) occurs upon heating with Ac2O at 60-degrees-C. 3-(3,3-Dicyanopropoxy) quinoline 1-oxide (5) also cyclizes to the pyranoquinoline (6) when treated with Ac2O at room temperature in chloroform-DMF.