中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 6-Chloro-4-(2-chlorophenyl)-1,2-dihydro-1-methyl-2-oxo-3-quinolinecarboxylic acid ethyl ester | 136280-97-2 | C19H15Cl2NO3 | 376.239 |
—— | 6-chloro-4-(2-chlorophenyl)-1,2-dihydro-1-methyl-2-oxoquinoline-3-carboxylic acid | 136280-98-3 | C17H11Cl2NO3 | 348.185 |
—— | ethyl 2,6-dichloro-4-(2-chlorophenyl)-3-quinolinecarboxylate | 136281-12-4 | C18H12Cl3NO2 | 380.658 |
—— | methyl 6-chloro-4-(2-chlorophenyl)-2-methoxy-3-quinolinecarboxylate | 136281-13-5 | C18H13Cl2NO3 | 362.212 |
—— | 6-chloro-4-(2-chlorophenyl)-2-methoxy-3-quinolinecarboxylic acid | 136281-14-6 | C17H11Cl2NO3 | 348.185 |
—— | 6-Chloro-4-(2-chloro-phenyl)-3-isocyanato-1-methyl-1H-quinolin-2-one | 152089-34-4 | C17H10Cl2N2O2 | 345.185 |
The present work represents a novel methodology for the selective arylation of coumarin‐3‐carboxylates with arylboronic acids via a photochemical route, marking the first‐ever attempt for the direct alkenyl C−H arylation using rose bengal as a photocatalyst, which is a readily available and cost‐effective alternative to transition metal catalysis. The reaction proceeds smoothly in MeOH/H2O solvent media in the presence of radical initiator affording the arylated products in good yields (60–80 %). The reaction parameters such as visible light, radical initiator, oxidant, anhydrous solvent, and inert atmosphere play a crucial role for the success of this methodology. The substituents present on the substrate show a significant effect on the conversion. This study provides a valuable contribution to the field of organic synthesis offering a new and efficient approach to the arylation of coumarin‐3‐carboxylic acid esters with a broad substrate scope and high functional group tolerance. It is a versatile method and provides a direct access to biologically relevant 4‐arylcoumarin‐3‐carboxylates.
C–C bond formation of tautomerizable quinolinones. C–OH bond activation using BOP reagent and boronic acids.