The ''naked sugar'' (+)-1 (1R,2S,4R)-2-cyano-7-oxabicyclo[2.2.1]hept-5-en-2-yl (1S')-camphanate) has been converted into (+)-(1R,4R,5R,6R)-3-methylidene-5-exo,6-exo(isopropylidenedioxy)-7-oxabi cyclo[2.2.1]heptan-2-one ((+)-3) and (-)-(1S,4R,5R,6R)-5-exo-( ...
1992