({2-[({(3S,7R,8R,9S)-7-benzyl-8-(hydroxy)-9-methyl-2,6-dioxo-1,5-dioxonan-3-yl}amino)carbonyl]-4-methoxypyridine-3-yl}oxy)methyl acetate → ({2-[({(3S,7R,8R,9S)-7-benzyl-9-methyl-8-[(2-methylprop-2-enyl)oxy]-2,6-dioxo-1,5-dioxonan-3-yl}amino)carbonyl]-4-methoxypyridine-3-yl}oxy)methyl acetate

Participants

Reaction Steps

Compound 6 was prepared in 40% yield using Compound 3 (13.4 g, 25.97 mmol) with dppf (1.44 g, 2.60 mmol), Pd2dba3 (0.59 g, 0.65 mmol) and ethyl methallylcarbonate (4.87 g, 33.8 mmol). Filtration through a bed of silica gel (hexane-acetone) afforded a white solid, which upon recrystallization from toluene gave white tetragonal crystals: m.p.=102-104° C. Spectral data were consistent with the assigned structure.

Provenance & Evidence