Synthesis of ?-Extended Benzofulvenes: A Pd-Catalyzed Cascade Annulation Process Comprising C-C Bond Formation Followed by 1,6-Conjugate Addition

A Pd-catalyzed cascade annulation process comprising C-C bond formation followed by 1,6-conjugate addition for pi extended benzofulvenes is reported. This process is compatible with a wide range of functionalities for both the p-quinone methides and internal alkynes, leading to diverse pi-extended benzofulvenes. Additionally, this strategy is also applicable for aryne annulation with p-quinone methides.

Automated summary

A Pd-catalyzed cascade annulation process involving C-C bond formation and 1,6-conjugate addition for pi-extended benzofulvenes is described. The process is compatible with various functionalities of p-quinone methides and internal alkynes, resulting in diverse pi-extended benzofulvenes. Furthermore, this strategy can also be applied to aryne annulation with p-quinone methides.