Trifluoroacetic acid → 3-[(4-Chlorophenyl)(2,2-difluorocyclopropyl)methyl]-7-[(methylsulfonyl)methyl]-1H-indole

Participants

Reaction Steps

In three parallel batches in each case 3.08 g (13.9 mmol) of indium(III) chloride and 1.6 ml (20.9 mmol) of trifluoroacetic acid were added to in each case 2.54 g (11.6 mmol) of the compound from Example 159A and 2.92 g (13.9 mmol) of the compound from Example 86A in 125 ml of 1,2-dichloroethane, and the mixture was heated under reflux overnight. It was diluted in each case with dichloromethane, and the three batches were combined and washed with saturated aqueous sodium bicarbonate solution, water and saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered through kieselguhr and concentrated. The residue was purified by preparative SFC (ethylpyridine column; mobile phase: carbon dioxide/methanol gradient; 150 bar; 35° C.) to result in 995 mg (7% of theory) of the title compound as mixture of diastereomers.

Provenance & Evidence