Hetero-Diels–Alder reaction of 3-aroylpyrrolo[2,1-c][1,4]benzoxazines with styrene. Synthesis of pyrano[4′,3′: 2,3]pyrrolo[2,1-c][1,4]benzoxazines

Resumo

The hetero-Diels–Alder reaction of 3-aroylpyrrolo[2,1-c][1,4]benzoxazine-1,2,4-triones with styrene afforded mixtures of diastereoisomeric (10R*,11aR*)- and (10S*,11aR*)-8-aryl-10-phenyl-10,11-dihydropyrano[4′,3′: 2,3]pyrrolo[2,1-c][1,4]benzoxazine-6,7,12-triones.