Palladium-catalyzed [4+2] annulation of aryl and alkenyl carboxamides with 1,3-dienes
via C–H functionalization is developed using air as the terminal oxidant. The method
demonstrates good functional group tolerance and high stereoselectivity, affording
a series of 3,4-dihydroisoquinolones and 5,6-dihydropyridinones in yields of up to
99%.
Key words
palladium - [4+2] annulation - carboxamides - dienes - C–H functionalization - 3,4-dihydroisoquinolones
- 5,6-dihydropyridinones