Dichloromethane → HCID 46932597, compound

Participants

Reaction Steps

To a suspension of 2-isopropyl-1H-benzoimidazole-4-carboxylic acid (1-piperidin-4-ylmethylpiperidin-4-ylmethyl)amide (2.1 g, 5.29 mmol) in tetrahydrofuran (26 mL) at room temperature was added N,N-diisopropylethylamine (2.05 g, 15.87 mmol), dichloromethane (12 mL) and N,N-dimethylformamide (5 mL). To the resulting suspension was slowly added o-chlorobenzoyl chloride (1.02 g, 5.82 mmol), and the reaction mixture was stirred for 0.5 h at room temperature. The solution was concentrated in vacuo, the resulting residue diluted with acetic acid (7.5 mL) and water (0.5 mL), and the product purified by reverse phase preparative HPLC. The purified salt was partitioned between dichloromethane and 1M aqueous sodium hydroxide, the organic layer removed and the aqueous layer re-extracted with dichloromethane, and the combined organic layers washed with brine, dried over sodium sulfate and concentrated in vacuo to give the title compound as a white foam (1.75 g, 3.26 mmol, 62%). (m/z): [M+H]+ calcd for C30H38ClN5O2) 536.28. found 536.3. 1H NMR (300 MHz, DMSO-d6): 0.90 (br m, 2H), 1.24 (d, 6H), 1.45 (br m, 2H), 1.68 (br m, 8H), 1.96 (m, 1H), 2.72 (br m, 5H), 3.08 (m, 2H), (3.20, m, 3H), 4.40 (br m, 1H), 7.14 (t, 1H), 7.28 (m, 2H), 7.39 (m, 1H), 7.49 (dd, 1H), 7.66 (dd, 1H).

Provenance & Evidence