Improved Syntheses of (+)-Lentiginosine and (1S,2S,7R,8aS)-Trihydroxyoctahydroindolizine by Butenol Cycloaddition to Enantiopure Protected Dihydroxy Pyrroline N-Oxides - Goti, Andrea; Cardona, Francesca; Brandi, Alberto (Synlett, 1996)