A solution of 1.47 g (5.83 mmol) of 1,1′-(azodicarbonyl)dipiperidine in 50 ml of toluene is added dropwise to a solution of 1 g (3.89 mmol) of ethyl 5-trifluoromethyl-1H-indole-2-carboxylate, 0.63 g (5.83 mmol) of 4-pyridylcarbinol and 1.46 ml (5.83 mmol) of tributylphosphine in 50 ml of toluene. The reaction mixture is stirred overnight at room temperature and then concentrated under reduced pressure and chromatographed on a column of silica (eluent: dichloromethane/methanol). 1.05 g of expected product are obtained.
