1-Hydroxybenzotriazole → ETHYL N-[4-({5-CYCLOHEXYL-3-[4-(TRIFLUOROMETHOXY)PHENYL]-1H-PYRAZOL-1-YL}METHYL)BENZOYL]-beta-ALANINATE

Participants

Reaction Steps

A solution of 177.8 mg product from Step D Example 1, 92.0 mg EDC, 64.9 mg HOBt in 1.5 mL DMF was stirred at room temperature for 30 minutes. Diisopropylethylamine (DIEA, 84 μL) and β-amino-alanine ethyl ester hydrochloride (73.7 mg) were added and the mixture stirred for additional 16 hours. The solvent was removed under reduced pressure. Some crystalline product precipitated after dissolving the residue in 14 mL 3:2 MeCN and water with 0.1% TFA. More title compound was isolated by preparative HPLC of the filtrate using 60˜80% MeCN gradient over 10 minutes at 8.0 mL per minute with 0.1% TFA on a 9.4×250 mm SB-C18 Zorbax column. 1H NMR (CD3OD, 600 MHz) δ 7.84˜7.87 (m, 2H), 7.75 (d, J=8.4 Hz, 2H), 7.28 (d, J=8.3 Hz, 2H), 7.18 (d, J=8.2 Hz, 2H), 6.56 (s, 1H), 5.46 (s, 2H), 4.12 (q, J=7.1 Hz, 2H), 3.60 (t, J=6.8 Hz, 2H), 2.62 (t, J=6.8 Hz, 2H), 2.60 (tt, J=11.7 & 3.3 Hz, 1H), 1.73˜1.77 (m, 4H), 1.68˜1.71 (m, 1H), 1.37˜1.43 (m, 2H), 1.24˜1.35 (m, 3H), 1.21 (t, J=7.1 Hz, 3H). LC-MS: 2.47 min. (M+H=544.4).

Provenance & Evidence