The Diels-Alder adduct (-)-5 (a "naked sugar") of furan to 1-cyanovinyl (1R')-camphanate was converted into (+)-(1R,5S,6S,7S)-6-exo,7-exo-(isopropylidenedioxy)-2,8-dioxabicylo[3.2. 1]octan-3-one and into (+)-(1R,5S,6S,7S)-7-endo-(benzyloxy)-6-exo-{[(t-buty ...
1991