Triethylamine → 2-Ethynyl-3'',4''-dimethoxy-biphenyl-4-carboxylic acid (1-methyl-4-pyridin-3-yl-butyl)-amide

Participants

Reaction Steps

A solution of 459 mg of 3',4'-dimethoxy-2-ethynyl[1,1'-biphenyl]-4-carboxylic acid in 8 mL of dimethylformamide was cooled in an ice bath and treated with 0.25 mL of triethylamine and 0.38 mL of diphenylphosphoryl azide. After 1 hour. 0.3 mL of (R)alpha-methyl-3-pyridinebutanamine was added and the reaction mixture was allowed to warm to room temperature over 48 hours. The reaction mixture was diluted with ethyl acetate, washed with water and brine, dried and concentrated. The residue was chromatographed over 50 g of silica gel eluting with ethyl acetate and the product was crystallized from ethyl acetate-hexane to give 576 mg of (R)-2-Ethynyl-3',4'-dimethoxy-N-[1-methyl-4-(3-pyridinyl)butyl][1.1'-biphenyl]-4-carboxamide, mp 135°-137° C.

Provenance & Evidence