Methyl iodide → HCID 57947619, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of (S)-methyl 4-(tert-butoxycarbonylamino)-5-(tert-butoxycarbonyloxy)-2,2-difluoropentanoate (46.0 g, 0.12 mol) and MeI (15.0 mL, 0.24 mol) in DMF (300 mL) was added sodium hydride (60%, 7.2 g, 0.18 mol) at 0° C. The reaction mixture was stirred at 0° C. for 3 h and LC-MS showed the reaction was completed. The reaction was quenched with saturated NH4Cl solution and filtered. The filtrate was concentrated to remove most of DMF and the residue was dissolved in EtOAc (1.5 L). The organic layer was washed with water and brine, dried over Na2SO4. The organic layers were combined and concentrated. The resulting residue was purified on silica gel column (hexanes/EtOAc) to give (S)-methyl 4-(tert-butoxycarbonyl(methyl)amino)-5-(tert-butoxycarbonyloxy)-2,2-difluoropentanoate (42 g, 88%). LRMS (M+Na+) m/z 420.4.

Provenance & Evidence