Diisopropylethylamine → Methyl 4-(4-(dibutylcarbamoyl)-1-phenethyl-1H-imidazol-2-yl)-3-((S)-3-(hydroxymethyl)-1,2,3,4-tetrahydroisoquinoline-2-carbonyl)benzoate

Participants

Reaction Steps

To a solution of 2-(4-(dibutylcarbamoyl)-1-phenethyl-1H-imidazol-2-yl)-5-(methoxycarbonyl)benzoic acid (130 mg, 0.25 mmol) in DMF (5 mL) was added HATU (293 mg, 0.77 mmol), (S)-1,2,3,4-tetrahydroisoquinoline-3-yl-methanol (84 mg, 0.51 mmol) and diisopropylethylamine (269 μL, 1.54 mmol) at 0° C. The reaction mixture was allowed to warm to room temperature and stirred for 16 h. The reaction mixture was diluted with water and extracted with MTBE (3×). The combined organic layer was dried over Na2SO4 and concentrated to give crude product. The crude material was purified by flash chromatography (gradient from 0% to 50% EtOAc/hexanes) to provide the title compound (113 mg, 61%) as a light yellow oil. 1H NMR (DMSO-d6, 1:1 mixture amide rotamers) δ 8.14-8.01 (m, 2H), 7.64 (s, 1H), 7.34 (d, J=7.2 Hz, 1H), 7.26-7.21 (m, 3H), 7.17-7.03 (m, 5.5H), 6.98 (d, J=6.8 Hz, 0.5H), 5.03 (d, J=18.4 Hz, 0.5H), 4.91 (br s, 1H), 4.39 (br s, 0.5H), 4.24 (d, J=18.4 Hz, 0.5H), 4.16-4.07 (m, 2.5H), 3.91 (s, 3H), 3.88-3.85 (m, 0.5H), 3.76-3.73 (m, 0.5H), 3.65-3.55 (m, 1H), 3.39-3.34 (m, 2H), 3.24-3.00 (m, 2H), 2.96-2.85 (m, 3H), 2.70-2.65 (m, 2H), 1.50-1.11 (m, 8H), 0.88-0.76 (m, 6H); MS(ESI+) m/z 651.4 (M+H)+.

Provenance & Evidence