1-Hydroxybenzotriazole → [5-(1'-{[3,5-Diethoxy-4-(1-methyl-1H-pyrazol-4-yl)phenyl]carbonyl}-4-oxospiro[chroman-2,4'-piperidin]-6-yl)-2H-tetrazol-2-yl]methyl 2,2-dimethylpropanoate

Participants

Reaction Steps

Et3N (223 μL), HOBT (123 mg) and WSC hydrochloride (154 mg) were added to a DMF (8 mL) solution of 3,5-diethoxy-4-(1-methyl-1H-pyrazol-4-yl)benzoic acid (194 mg) and [5-(4-oxospiro[chroman-2,4′-piperidin]-6-yl)-2H-tetrazol-2-yl]methyl 2,2-dimethylpropanoate hydrochloride (349 mg), and stirred overnight at room temperature. The reaction liquid was poured into saturated saline water, extracted with ethyl acetate, and the organic layer was washed with water and saturated saline water. The organic layer was dried with sodium sulfate, filtered, concentrated, and purified through silica gel column chromatography (hexane/EtOAc) to obtain the title compound. 1H-NMR (400 MHz, CDCl3) δ: 8.69 (1H, d, J=4.0 Hz), 8.32 (1H, dd, J=8.0, 4.0 Hz), 8.14 (1H, s), 7.97 (1H, s), 7.17 (1H, d, J=8.0 Hz), 6.64 (2H, s), 6.50 (2H, s), 4.32-4.18 (1H, m), 4.08 (4H, q, J=8.0 Hz), 3.94 (3H, s), 3.64-3.20 (3H, m), 2.97 (2H, s), 2.10-1.75 (4H, m), 1.37 (6H, t, J=8.0 Hz), 1.22 (9H, s). MS [M+H]+=672.

Provenance & Evidence