Diisopropylethylamine → (S)-1-(2-benzyl-4-(3-(cyclopentyloxy)-4-methoxyphenyl)piperazin-1-yl)-2-(5-methyl-1H-1,2,4-triazol-3-yl)ethanone

Participants

Reaction Steps

A solution of 3-benzyl-1-(3-cyclopentyloxy-4-methoxy-phenyl)-piperazine (Example 2, Compound 90) (100 mg, 0.273 mmol), in CH2Cl2:DMF (1:1, 3 mL), then treated with (5-methyl-1H[1,2,4]triazol-3-yl)-acetic acid (50.0 mg, 0.355 mmol), followed by the addition of diisopropylethylamine μL, 0.819 mmol) and HATU (135 mg, 0.355 mmol). (100 The reaction stirred at room temperature for 8 h. The solution was washed with a saturated aqueous solution of NaHCO3 (10 mL) followed by brine (10 mL). The organic portion was dried over MgSO4, filtered and evaporated to an oil which was purified by silica gel flash chromatography with 5% then 10% MeOH/EtOAc as eluant to afford product as a colorless solid (86 mg, 65%). 1H NMR (CDCl3) 1.50-1.65 (m, 4H), 1.70-2.00 (m, 6H), 2.42 (s, 3H), 2.46 (s, 2H), 2.61-2.99 (m, 2H), 3.21-3.51 (m, 3H), 3.72-3.99 (m, 4H), 4.62-4.79 (m, 1H), 6.38-6.60 (m, 2H), 6.70-6.82 (m, 1H), 7.20-7.39 (m, 5H). 13C NMR 44.8 (CH2), 53.5 (CH2), 54.8 (CH), 55.3 (CH2), 56.6 (CH2), 63.2 (CH2), 105.4 (CH), 127.1 (CH), 128.2 (CH), 129.0 (CH), 130.0 (CH), 138.0, 139.8 (CH). LC/MS (Method B) 3.32 min, [M+1]+ 490.2.

Provenance & Evidence