Water → Di-tert-butyl (4-{(3R,4S,5S)-3-[(tert-butoxycarbonyl)amino]-4-[(methoxycarbonyl)amino]-5-methylpiperidin-1-yl}pyridin-3-yl)imidodicarbonate

Participants

Reaction Conditions

Reaction Steps

To a solution of di-tert-butyl (4-{(3R,4S,5S)-4-amino-3-[(tert-butoxycarbonyl)amino]-5-methylpiperidin-1-yl}pyridin-3-yl)imidodicarbonate (1.27 g, 2.43 mmol) in DCM (50.0 mL) at 0° C., DIPEA (983 mg, 7.60 mmol) was added followed by a solution of methyl chloroformate (244 mg, 2.59 mmol) in DCM (10 mL). The solution was stirred at 0° C. for 30 min., then at room temperature for additional 30 min., then the reaction was quenched with 1.0 M aq. Na2CO3 in water (75.0 mL, 75.0 mmol). The organic layer was separated, washed with brine, then dried over Na2SO4, filtered and concentrated to give the crude sub-title compound as a yellow foamy solid (1.545 g, 109%). The crude product was used directly in the next step without further purification. LCMS calc. for C28H46N5O8 (M+H)+: m/z=580.3. Found: 580.3.

Provenance & Evidence