Structures of Side Products from Helferich Reaction Synthesis of 3α,12β,25-Trihydroxy-20S,24R-Epoxydammarane Glucosides


Glycosylation of 3α-acetoxy-12β,25-dihydroxy-20S,24R-epoxydammarane (2) by 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosylbromide (5) in the presence of Hg(CN)2 in nitromethane at 22°C produced the acetylated 12,25-di-O-β-D-glucopyranoside of 3α,12β,25-trihydroxy-20S,24R-epoxydammarane (6) and also formed the side product 3α-acetoxy-12β-(2′,3′,4′,6′-tetra-O… (More)
DOI: 10.1007/s10600-014-0824-0


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