3-Deoxy-1,2-O-isopropylidene-3-C-methyl-α-D-allofuranose was stereoselectively converted into 3,5-dideoxy-4-O-(methoxymethyl)-3,5-di-C-methyl-6-O-pivaloyl-L-talose ethylene dithioacetal (31) via 3,5-dideoxy-4-O-(methoxymethyl)-3,5-di-C-methyl-L-talopyranuro-6,2-lactone ethylene dithioacetal (24) in 10 steps (23.6% overall yield). Desulfurization [Raney Ni W-4, 92% yield] of 31 followed by three-step
A fluorinated amphotericin B (AmB) derivative, 28-19F-AmB methylester (3), labeled at the polyene moiety, was synthesized by combining chemical synthesis with degradation of a natural product via cross-coupling reactions and macrolactonization. The fluorinated derivative 3 showed antifungal activity similar to that of AmB, and is expected to be a powerful tool for NMR-based investigation of the mechanism