Construction of Cyclobutane-fused Tetracyclic Skeletons via Substrate-dependent EnT-enabled Dearomative [2+2] Cycloaddition of Benzofurans (Benzothiophenes) /Maleimides

Herein, a novel and facile organic photosensitizer (thioxanthone) mediated energy-transfer-enabled (EnT-enabled) dearomative [2+2] cycloaddition of aromatic heterocycle/maleimides for green synthesis of cyclobutane-fused polycyclic skeletons is reported. Mechanistic investigations revealed that...