Ethylamine hydrochloride → (1S,2R)-4'-(4-Chlorophenyl)-N-ethyl-2',3',9'-trimethylspiro[cyclopropane-1,6'-thieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepine]-2-carboxamide

Participants

Reaction Steps

To a solution of crude (1S,2R)-4′-(4-chlorophenyl)-2′,3′,9′-trimethylspiro[cyclopropane-1,6′-thieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepine]-2-carboxylic acid (Compound 228; 0.09 g, 0.218 mmol) in DCM (2.4 mL) was added N,N-diisopropylethylamine (0.190 ml, 1.090 mmol), ethylamine hydrochloride (0.071 g, 0.872 mmol) and HOBt (0.017 g, 0.109 mmol). The mixture was stirred for 10 min at rt (still heterogeneous) before HATU (0.166 g, 0.436 mmol) was added, still at rt. After 20 min, the reaction was filtered on a pad of silica gel. The silica gel was successively rinsed with EtOAc/hexane (5:5) to (10:0) and DCM/MeOH (9:1). The filtrate was concentrated to dryness, and the residue was purified by reverse phase chromatography to give the desired product as an off-white solid (34 mg). LRMS (M+H)+: 440 m/z. 1H NMR (major conformer reported only) (400 MHz, DMSO-d6) δ 8.36 (br. s., 1H), 7.37-7.54 (m, 4H), 2.89-3.01 (m, 1H), 2.69-2.82 (m, 1H), 2.62 (s, 3H), 2.36 (s, 3H), 2.07 (dd, J=5.15, 8.81 Hz, 1H), 1.92 (t, J=6.40 Hz, 1H), 1.78 (t, J=8.00 Hz, 1H), 1.43 (s, 3H), 0.84 (t, J=7.10 Hz, 3H).

Provenance & Evidence