An alternative method for the direct arylvinylation of (quinolin-8-yl)methanone with
substituted N′-benzylidene-4-methylbenzenesulfonohydrazide is described. The desired 3-aryl-1-(quinolin-8-yl)prop-2-en-1-one
products are obtained in high yields through the catalytic reaction of (quinolin-8-yl)methanone
and N′-arylidene-4-methylbenzenesulfonohydrazide (2 equiv) with [Rh(PPh3)3Cl] (10 mol%), Ag2O (0.5 equiv), and Cs2CO3 (2 equiv) at 130 °C for 48 hours. Two plausible mechanisms involving C–H activation
and migratory insertion of the carbene into the rhodium–carbon bond were proposed
to explain the formation of the product.
Key words
quinolinone - rhodium complex - hydrazones - C–C coupling - double-bond formation