Substituted .gamma.-butyrolactones. Part 31. 2,4(3H,5H)-Furandione: heteroannulations with aromatic o-amino carbonyl compounds and condensations with some vic-polyones
Substituted .gamma.-butyrolactones. Part 31. 2,4(3H,5H)-Furandione: heteroannulations with aromatic o-amino carbonyl compounds and condensations with some vic-polyones