Trifluoroacetic acid → (1R,3S)-5,7-difluoro-1-{2-[3-(5-methyl-2-m-tolyloxazol-4-ylmethoxy)cyclohexyloxy]ethyl}-1H-indole-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

79 mg of 5,7-difluoroindolecarboxylic acid are dissolved in 2 ml of dried DMF, and 34 mg of 60 percent strength sodium hydride suspension are added. After 30 min at room temperature, 100 mg of ((1R,3S)-[3-(5-methyl-2-m-tolyloxazol-4-ylmethoxy)cyclohexyloxy)ethyl toluene-4-sulfonate, dissolved in 2 ml of DMF, are added. The mixture is stirred at 65° C. until the reaction has gone to completion (monitored by LC-MS). 50 μl of TFA are added, the mixture is filtered and the residue is purified by RP-HPLC. This gives 40 mg of (1R,3S)-5,7-difluoro-1-{2-[3-(5-methyl-2-m-tolyloxazol-4-ylmethoxy)cyclohexyloxy]ethyl}-1H-indole-2-carboxylic acid as a colorless oil. C29H30F2N2O5 (524.56), MS (ESI): 525 (M+H+).

Provenance & Evidence