Annulation of furan-bridged 10-membered rings on N-heterocycles through [8+2] cycloaddition of dienylazaisobenzofurans and dimethyl acetylenedicarboxylate
Keywords: [8+2] Cycloaddition; Dienylazaisobenzofurans; Carbene complex; Twofold Diels-Alder; Heterolignan;