To a mixture of (108 mg, 0.403 mmol) 3-(4′-hydroxy-2′-methyl-biphenyl-4-yl)-acrylic acid methyl ester, [2-(2,6-dichloro-phenyl)-4-isopropyl-2H-pyrazol-3-yl]-methanol (126 mg, 0.443 mmol) and toluene (2.1 mL) is added 1,1′-(azodicarbonyl)dipiperidine (112 mg, 0.443 mmol) followed by tri-n-butylphosphine (109 μL, 0.443 mmol). The reaction is kept overnight at room temperature. The reaction mixture is diluted with hexane and the solid is filtered. The concentrated filtrate is purified via flash chromatography eluting with 15% ethyl acetate/heptane) to give 183 mg (85%) of the ester.
