Triethylamine → 3,5-Dimethyl-isoxazole-4-sulfonic Acid 7-{[1-(piperidine-4-carbonyl)-piperidin-4-ylmethyl]-propyl-amino}-5,6,7,8-tetrahydro-naphthalen-2-yl Ester

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Reaction Steps

Under an inert atmosphere 3,5-dimethyl-isoxazole-4-sulfonic acid 7-(piperidin-4-ylmethyl-propyl-amino)-5,6,7,8-tetrahydro-naphthalen-2-yl ester (400 mg, 0.87 mmol), piperidine-1,4-dicarboxylic acid mono-tert-butyl ester (199 mg, 0.87 mmol, 1 eq.), EDCl (166 mg, 0.87 mmol, 1 eq.), triethylamine (0.25 mL, 1.79 mmol, 2 eq.), and dichloromethane (35 mL) were combined. The mixture was stirred at room temperature for 48 h and then concentrated in vacuo. The residue was taken up in EtOAc (50 mL) and washed with water (30 mL), 1 N NaOH (30 mL), brine (30 mL), and then dried (MgSO4). The solution was filtered and concentrated to afford a yellow oil. The oil was flash chromatographed on silica gel eluting with 20% acetone in hexanes to afford the protected amine as a foam (447 mg), which was deprotected with trifluoroacetic acid, as described herein, to afford 3,5-dimethyl-isoxazole-4-sulfonic acid 7-{[1-(piperidine-4-carbonyl)-piperidin-4-ylmethyl]-propyl-amino}-5,6,7,8-tetrahydro-naphthalen-2-yl ester (320 mg), 114M+H]+=609.

Provenance & Evidence