反应详情

To a solution of methyl 3,5-diamino-6-chloropyrazine-2-carbamate (5 g, 0.025 mols) in 2:1 THF/MeOH (90 mL) was added 1M LiOH (62 mL, 0.062 mols). After the reaction was stirred at r.t. 72 hrs, 1N HCl (62 mL, 0.062 mols) was added. The reaction was filtered and washed with water (3×10 mL) to give 3,5-diamino-6-chloropyrazine-2-carboxylic acid as white solid 4.3 g (93% yield). LCMS (m/z): 189.1 (MH+); LC Rt=1.05 min.

1. filtrationThe reaction was filtered
2. washwashed with water (3×10 mL)