Cl.[F:2][C:3]([F:18])([F:17])[C:4]1[N:5]=[CH:6][C:7]([NH:10][C@H:11]2[CH2:15][CH2:14][CH2:13][C@@H:12]2[NH2:16])=[N:8][CH:9]=1.[F:19][CH:20]([F:30])[C:21]1[CH:29]=[CH:28][CH:27]=[CH:26][C:22]=1[C:23](O)=[O:24].C(N(CC)CC)C.O1POPOP1>C(Cl)Cl>[F:19][CH:20]([F:30])[C:21]1[CH:29]=[CH:28][CH:27]=[CH:26][C:22]=1[C:23]([NH:16][C@H:12]1[CH2:13][CH2:14][CH2:15][C@@H:11]1[NH:10][C:7]1[CH:6]=[N:5][C:4]([C:3]([F:2])([F:17])[F:18])=[CH:9][N:8]=1)=[O:24]To a solution of (1S,2S)-1-N-[5-(trifluoromethyl)pyrazin-2-yl]cyclopentane-1,2-diamine hydrochloride (Intermediate 14; 100 mg, 0.35 mmol), 2-(difluoromethyl)benzoic acid (CAS number 799814-32-7; 61 mg, 0.35 mmol) and triethylamine (0.148 ml, 1.06 mmol) in DCM (2 ml) was added 1,3,5,2,4,6-trioxatriphosphorinane, 2,4,6-tripropyl-, 2,4,6-trioxide (CAS number 68957-94-8; 50% in ethyl acetate, 0.417 ml, 0.71 mmol). The reaction mixture was stirred at room temperature for 3 hours. To this was then added further 1,3,5,2,4,6-trioxatriphosphorinane, 2,4,6-tripropyl-, 2,4,6-trioxide (CAS number 68957-94-8; 50% in ethyl acetate, 0.417 ml, 0.71 mmol) and stirred at room temperature overnight. The reaction was partitioned between DCM and a saturated solution of sodium bicarbonate, filtered through a hydrophobic frit and concentrated in vacuo. The resulting residue was purified by column chromatography (silica, 0-100% ethyl acetate/petrol) and then triturated with diethyl ether to afford the title compound.
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