Diisopropylethylamine → HCID 24852276, compound

Participants

Reaction Conditions

Reaction Steps

A solution of N-{5-[2-(4′-bromo-2′-fluorobiphenyl-4-yl)ethyl]-2,2-dimethyl-1,3-dioxan-5-yl}acetamide (225 mg) of Reference Example 10, 5-methylthiophene-2-thiol (65 mg), diisopropylethylamine (129 mg), tris(dibenzylideneacetone)dipalladium(0) chloroform adduct (12.9 mg) and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos) (14.9 mg) in 1,4-dioxane (2 mL) was heated under reflux for 6 hr under a nitrogen atmosphere. Tris(dibenzylideneacetone)dipalladium(0) chloroform adduct (12.9 mg) and Xantphos (14.9 mg) were added to the reaction mixture, and the mixture was further heated under reflux for 8 hr. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was dissolved in ethanol (4 mL). Concentrated hydrochloric acid (2 mL) was added, and the mixture was stirred at 80° C. for 4 hr. The reaction mixture was concentrated, aqueous potassium carbonate solution was added to the residue, and the precipitated crystals were collected by filtration. The crude crystals were purified by preparative HPLC to give the title compound (51 mg) as brown crystals.

Provenance & Evidence