New syntheses of two epimers of (+)-castanospermine: (+)-8a-Epi- and (+)-1,8a-Di-epi-castanospermine

Article abstract of DOI:10.1016/S0040-4020(98)01218-6

Two epimers of (+)-castanospermine, (1S,6S,7R,8R,8aS)-1,6,7,8- tetrahydroxyindolizidine [(+)-8a-epi-castanospermine] (4) and (1R,6S,7R,8R,8aS) derivative [(+)-1,8a-di-epi-castanospermine] (5) were synthesized from methyl α-D-glucopyranoside.