Reactions of Diels–Alder adducts of a sugar-derived dihydropyranone leading to fused polycyclic compounds
作者:Christian A. Iriarte Capaccio、Oscar Varela
DOI:10.1016/j.carres.2004.01.008
日期:2004.4
having three or four fused rings. Reduction of the carbonyl group of the butadiene adduct (2) took place with low facial selectivity affording the alcohols 5 and 6 in 1:1.4 ratio. In contrast, a higher diastereoselection was observed for the reduction of the carbonyl of the cyclopentadiene adducts 3 and 4 to give the endo alcohols 10 and 13, respectively. The epoxidation of 6 showed low facial selectivity