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

Participants

Reaction Steps

Compound 12 was prepared in 95% yield using Compound 6 (6.0 g, 10.5 mmol) with 10% palladium on charcoal (1.2 g) and hydrogen (40 psi) in ethyl acetate (150 mL) for 1.5 hour. Recrystallization from a mixture of hot methylcyclohexane and toluene (4:1) gave 5.7 g of white needles: m.p.134-136° C. Spectral data were consistent with the assigned structure.

Provenance & Evidence