1-Hydroxybenzotriazole → 2-[3-(4-chlorophenyl)-4-cyclopropyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl]-N-{1-[3-(trifluoromethyl)phenyl]ethyl}acetamide

Participants

Reaction Steps

2000.0 mg (6.809 mmol) of [3-(4-chlorophenyl)-4-cyclopropyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl]-acetic acid from Example 88A and 1417.0 mg (7.490 mmol) of 1-[3-(trifluoromethyl)phenyl]-ethanamine are placed in 10 ml of dimethylformamide and treated with 1104.0 mg (8.171 mmol) of HOBt. After 10 mins' stirring, 1697.0 mg (8.852 mmol) of EDC hydrochloride are added and the mixture is stirred overnight at room temperature. For the workup, the reaction mixture is partitioned between dichloromethane and water, and the organic phase is separated, dried over sodium sulphate and concentrated. The residue is purified by flash chromatography on silica gel (eluent: dichloromethane/methanol first 200:1, then 100:1). A subsequent enantiomer separation by preparative HPLC on chiral phase [Method 14] yields 1460 mg (46% of theory) of the enantiomerically pure target compound (see also Example 81).

Provenance & Evidence