Hydrochloric Acid → Methyl[3-methyl-5-(pyridin-2-yl)-1-(pyrimidin-5-yl)-1h-pyrazol-4-yl]acetate

Participants

Reaction Conditions

Reaction Steps

1.767 g (9.73 mmol) of copper(II) acetate and 1.049 ml (12.973 mmol) of pyridine were added to 1.5 g (6.486 mmol) of methyl[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl]acetate in 20 ml of dichloromethane. 1.607 g (12.973 mmol) of 5-pyrimidinylboronic acid were then added, and the mixture was stirred at 20° C. for 48 h. The mixture was poured into 1-molar aqueous HCl (10 ml) and extracted with dichloromethane. The combined organic phases were dried with magnesium sulfate, filtrered and concentrated. The crude product was purified by preparative HPLC. This gave a mixture of ester and acid which was heated at reflux in methanol with a drop of sulfuric acid for 4 h. The reaction mixture was poured into water (20 ml), neutralized and extracted with dichloromethane. The combined organic phases were dried with magnesium sulfate and concentrated. This gave 0.031 g of product (1.47% of theory).

Provenance & Evidence