Ethyl bromoacetate → Ethyl [3-({4-[3-(3,4-dimethoxyphenyl)-4,4-dimethyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl]piperidin-1-yl}carbonyl)-4-methylphenoxy]acetate

Participants

Reaction Conditions

Reaction Steps

0.5 g of 5-(3,4-dimethoxyphenyl)-2-{1-[(5-hydroxy-2-methylphenyl)carbonyl]piperidin-4-yl}-4,4-dimethyl-2,4-dihydro-3H-pyrazol-3-one (compound described in example 85) and 0.3 g potassium carbonate are suspended in 20 ml of DMF. 0.2 ml of ethyl bromoacetate is added and the reaction mixture is heated to 50° C. under a blanket of nitrogen for about 16 h until the reaction is completed according to TLC analysis. The solvent is evaporated under reduced pressure, and the remaining residue is taken up in EA. The organic phase is washed twice with water and brine, dried over MgSO4, and the solvent is removed under reduced pressure. Purification of the resulting crude product by crystallization from diethyl ether yields the title compound.

Provenance & Evidence