反应详情

The solution of HCl (9.1 g, 4% solution in methanol) was added to the suspension of (28.5 g, 0.1 mol) of methyl 1-(3-chloropyridin-2-yl)-5-hydroxy-3-(hydroxymethyl)-4,5-dihydro-1H-pyrazole-5-carboxylate in 100 ml of methanol. After ca. 30-60 min at 25-30° C., the clear yellow solution had formed. Methanol was removed in vacuo and the precipitate was washed with water. Yield 26.7 g, 100%. M.p. 104° C.

1. customthe clear yellow solution had formed
2. customMethanol was removed in vacuo
3. washthe precipitate was washed with water