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New syntheses of two epimers of (+)-castanospermine: (+)-8a-Epi- and (+)-1,8a-Di-epi-castanospermine
Autor:
Aleksander Zamojski, Ewa Bartnicka
Publikováno v:
Tetrahedron. 55:2061-2076
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.