2-[(R)-4-(6-Chloro-4,5-dimethyl-pyridazin-3-yl)-2-methyl-piperazin-1-yl]-4-trifluoromethyl-pyrimidine-5-carboxylic acid ethyl ester → 2-{(R)-4-[6-(2,4-difluoro-benzyl)-4,5-dimethyl-pyridazin-3-yl]-2-methyl-piperazin-1-yl}-4-trifluoromethyl-pyrimidine-5-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-[(R)-4-(6-chloro-4,5-dimethyl-pyridazin-3-yl)-2-methyl-piperazin-1-yl]-4-trifluoromethyl-pyrimidine-5-carboxylic acid ethyl ester (229 mg, 0.50 mmol, 1 eq) and THF (1.4 mL) in a microwave vial is added 2,4-difluorobenzylzinc bromide (2.0 mL 0.5 M solution in THF, 2.0 mmol, 4 eq) and tetrakis(triphenylphosphine)palladium (25 mg, 0.03 mmol, 0.05 eq). The vial is sealed and heated in the microwave at 60° C. (high absorption setting) for 25 min. An additional aliquot of 2,4-diflorobenzylzinc bromide (1.0 mL 0.5 M solution in THF, 1.0 mmol, 2 eq) is added and the reaction mixture is heated in the microwave at 100° C. (high absorption setting) for 5 min. The reaction mixture is quenched with water (10 mL) and then extracted with EtOAc (2×25 mL). The combined organic fractions are dried over magnesium sulfate, concentrated and purified by silica gel chromatography (25-75% EtOAc/Heptane) to yield the desired compound (225 mg, 81%).

Provenance & Evidence