Benzene, 1-chloro-4-fluoro- → HCID 14032529, compound

Participants

Reaction Steps

To a stirred suspension of 1.1 g of sodium hydride (50% oil dispersion) in 40 ml of dimethylformamide was added, dropwise, under nitrogen, 4.0 g of 3-(1-methyl-4-piperidinyl)-1H-indazole dissolved in 25 ml of hot dimethylformamide. The reaction was stirred at ambient temperature for 45 min, and 2.9 ml of 4-fluorochlorobenzene was added. The temperature was increased to 120° and the reaction proceeded at this temperature for 24 hr. The reaction was poured into water and the aqueous mixture was extracted with ethyl acetate. The ethyl acetate extract was washed with water, dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was heated (steam bath) with 3N hydrochloric acid and the salt was collected. The salt was immediately recrystallized from water. The wet salt was treated with ammonium hydroxide and the base was extracted into dichloromethane. Evaporation of the dichloromethane in vacuo gave an oil. The oil solidified on standing. The solid was dissolved in ether and 1.4 g of fumaric acid was added. Recrystallization from 2-propanol gave 3.9 g (47.5%) of product, mp 176°-178° C.

Provenance & Evidence