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

Participants

Reaction Steps

A solution of (S)-1-(3-(cyclopentyloxy)-4-methoxyphenyl)-3-(pyrrolidin-1-ylmethyl)piperazine, dihydrochloride (Example 40, Compound 128) (173 mg, 0.40 mmol) in CH2Cl2 (1 mL) and DMF (1 mL) was treated with diisopropylethylamine (348 uL, 2.0 mmol), 2-(5-methyl-1H-1,2,4-triazol-3-yl)acetic acid CAS [720706-28-5] (68 mg, 0.48 mmol) followed by HBTU (162 mg, 0.48 mmol). The reaction mixture was stirred for 16 h after which time the mixture was partitioned between CH2Cl2 (3 mL) and a saturated aqueous solution of NaHCO3 (2 mL). The organic portion was further washed with NaHCO3 (2×3 mL) followed by brine (3 mL). The organic portion was then dried over MgSO4, filtered, and evaporated to afford quenched with evaporated and the residue purified by silica gel flash chromatography with 5% MeOH/EtOAc the 10% MeOH/EtOAc containing 1% NH4OH as eluant to afford product as a foam (123 mg, 64%). LC/MS (Method B) 2.18 min, [M+1]+ 483. Potency class C.

Provenance & Evidence