Diels-Alder reactions of chiral acrylylurea derivatives and resolution of the adducts. Convenient synthesis of optically pure methyl (3R,4R,6R)-bicyclo[2.2.1]heptene-4-carboxylate
Diastereoselective hydrochlorination of acrylylurea derivatives using titanium tetrachloride and alcohol. Chelation-controlled Michael addition of chloride and intramolecular proton transfer to the .alpha.-position
Diels-Alder reactions of chiral acrylylurea derivatives and resolution of the adducts. Convenient synthesis of optically pure methyl (3R,4R,6R)-bicyclo[2.2.1]heptene-4-carboxylate