Triphenylphosphine → 1-[3-(4-{4-[1-(2-Chloro-phenyl)-ethoxycarbonylamino]-3-methyl-isoxazol-5-yl}-phenyl)-prop-2-ynyl]-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid ethyl ester

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To a solution of {5-[4-(3-hydroxy-prop-1-ynyl)-phenyl]-3-methyl-isoxazol-4-yl}-carbamic acid 1-(2-chloro-phenyl)-ethyl ester (0.200 g, 0.49 mmol), ethyl 5-(trifluoromethyl)-1H-pyrazole-4-carboxylate (0.101 g, 0.49 mmol), and triphenylphosphine (0.127 g, 0.49 mmol) in THF (4 mL) was added diisopropyl azodicarboxylate (0.10 mL, 0.49 mmol), and the reaction was stirred at room temperature for 2 hours. The mixture was concentrated, and the residue was purified by preparative HPLC to give the title compound.

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