(S)-tert-butyl (4-methyl-1-((6-methyl-5-oxo-9-vinyl-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)pentan-2-yl)carbamate → (S)-tert-butyl (1-((9-ethyl-6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan 2-yl)carbamate

Participants

Reaction Steps

A mixture of (S)-tert-butyl (4-methyl-1-((6-methyl-5-oxo-9-vinyl-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)pentan-2-yl)carbamate (0.15 g, 0.332 mmol) and palladium on carbon (0.075 g, 0.070 mmol) in MeOH (3 mL) and ethyl acetate (3 mL) was stirred at RT under a balloon of hydrogen gas for 24 h. The reaction mixture was filtered through diatomaceous earth (Celite®) and the filtrate was concentrated under reduced pressure. The residue was purified by prep TLC (60% ethyl acetate and petroleum ether) to afford (S)-tert-butyl (1-((9-ethyl-6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan 2-yl)carbamate (0.11 g, 0.133 mmol, 40% yield) as a yellow semi solid. LC/MS (ESI) m/e 454.4, [(M+H)+, calcd for C26H36N3O4, 454.3]; LC/MS retention time (method D): tR=0.96 min.

Provenance & Evidence