
Synthesis of a protected trihydroxyindolizidine 3-carboxylate via a hetero-Diels–Alder addition of ethyl 2-nitrosoacrylate to a d-ribose-derived exo-glycal
Keywords: Polyhydroxylated indolizidine alkaloids; Ethyl bromopyruvate; Ethyl 2-nitrosoacrylate; Hetero-Diels–Alder cycloaddition; exo-Glycals; Catalytic hydrogenation