A NOVEL-APPROACH TO FUNCTIONALIZED POLYCYCLIC SYSTEMS - SYNTHESIS OF TETRACYCLIC COMPOUNDS BY SEQUENTIAL REARRANGEMENT-CYCLOADDITION REACTIONS OF 7-OXA-2,3-DIMETHYLENENORBORNENE DERIVATIVE
K. Konno et al., A NOVEL-APPROACH TO FUNCTIONALIZED POLYCYCLIC SYSTEMS - SYNTHESIS OF TETRACYCLIC COMPOUNDS BY SEQUENTIAL REARRANGEMENT-CYCLOADDITION REACTIONS OF 7-OXA-2,3-DIMETHYLENENORBORNENE DERIVATIVE, Heterocycles, 47(1), 1998, pp. 167-170
The tricyclic diene (6), readily accessible from a novel building bloc
k, 4H, 6H-thieno[3,4-c]furan 5,5-dioxide (1), reacted with a variety o
f dienophiles to give the tetracyclic perhydroazulene derivatives (7)
in good to high yield.