Water → Ammonia

Participants

Reaction Conditions

Reaction Steps

2-Pyrazinecarboxylic acid (2.15 g, 17.32 mmol) is placed in a hydrogenation bottle containing water (100 mL), sodium bicarbonate (1.45 g, 17.32 mmol) and palladium black (500 mg). The bottle is placed under hydrogen (40 p.s.i.) for 60 hours, filtered through celite and lyophilized. The residue is dissolved in water (25 mL), cooled to 0° C., and treated with sodium bicarbonate (3.78 g, 45.00 mmol) and benzyloxycarbonylchloride (6.25 mL, 41.60 mmol) in acetone (25 mL). After stirring 20 hours at ambient temperature, the acetone is removed in vacuo and the mixture is partitioned between methylene chloride (200 mL) and water (50 mL). The pH of the aqueous phase is adjusted to 2 with 1N HCl. The organic phase is washed with saline, dried over MgSO4, and concentrated in vacuo to give the title compound, MS (CI, NH3) m/z 416 [M+NH4 ]+.

Provenance & Evidence