HCID 59105415, compound → HCID 67753502, compound

Participants

Reaction Steps

To a solution of (E)-methyl 2-(4-benzyloxy-1,3-dimethylpyrazol-5-yl)-3-methoxyacrylate (56 g, 17.7 mmol) in methanol (560 ml) was subjected to hydrogenation in the presence of 5% powdered palladium/carbon (5.3 g). When the reaction completed, the mixture was filtered and the filtrate was concentrated under reduced pressure. The residue, when recrystallized from a solvent system of methanol/ethyl acetate/n-hexane, gave a purified (E)-methyl 2-(1,3-dimethyl-4-hydroxypyrazol-5-yl)-3-methoxyacrylate (38 g, yield 94.8 %). M.p.=172.7°-173.4 ° C.

Provenance & Evidence