Citric Acid → HCID 17848361, compound

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Reaction Steps

To a mixture of 2-methoxycarbonyl-3-(3-chloro-4-methoxybenzylamino)-5-chloropyrazine (prepared in the above Example 297(3)) 71 mg and 2-hydroxymethylpyridine 25 mg in tetrahydrofuran 3 ml is added potassium tert-butoxide 26 mg under ice cooling. The mixture is stirred for 30 minutes at the same temperature and diluted a 10% aqueous citric acid solution. The solution is extracted with ethyl acetate and the extract is washed with water and an aqueous saturated sodium chloride solution, dried over sodium sulfate and concentrated in vacuo. The residue is purified and separated with silica gel chromatography (silica gel 5 g, solvent; chloroform:ethyl acetate=3:1) and crystallized from isopropyl ether to give 2-methoxycarbonyl-3-(3-chloro-4-methoxybenzylamino)-5-(2-pyridylmethoxy)pyrazine as a pale yellow crystalline powder, 25 mg. mp 132-133° C., MS(m/z): 415(M+H)+

Provenance & Evidence