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

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-tert-butyl (4-methyl-1-((6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)pentan-2-yl)carbamate (200 mg, 0.470 mmol) (Preparation description in Example 2, Part D) in THF (4 mL) at 0° C. was added NaH (37.6 mg, 0.940 mmol). The reaction was stirred at 0° C. for 30 min then MeI (0.044 mL, 0.705 mmol) was added. The reaction mixture was then stirred at 0° C. for 16 h. The reaction mixture was quenched with ice cold water (50 mL) and extracted with ethyl acetate (3×30 mL). The combined organic layers and washed with brine (1×50 mL), dried over Na2SO4, filtered and concentrated under reduced pressure. The crude product was purified by silica gel chromatography using petroleum ether: ethyl acetate mobile phase to afford (S)-tert-butyl methyl(4-methyl-1-(6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yloxy)pentan-2-yl)carbamate (180 mg, 0.409 mmol, 87% yield) as a yellow solid. LC/MS (ESI) m/e 440.4, [(M+H)+, calcd for C25H34N3O4, 440.3]; LC/MS retention time (method I): tR=2.4 min.

Provenance & Evidence