Isobutylamine → tert-butyl (4S)-4-[4-((2-methylpropyl)methylcarbamoyl)piperidin-1-yl]azepane-1-carboxylate

Participants

Reaction Steps

tert-butyl (4S)-4-[4-(methoxycarbonyl)piperidin-1-yl]azepane-1-carboxylate (0.3 g, 0.92 mmol) was dissolved in DMF (4 mL) and isobutylamine (0.14 g, 0.18 mL, 1.84 mmol), HATU (0.53 g, 1.38 mmol) and DIPEA (0.36 g, 0.48 mL, 2.76 mmol) were added. The reaction mixture was stirred at rt for 48 h and the solvents were removed in vacuo. The residue was partitioned between DCM and sat. NaHCO3 sol., the organic layer was washed with sat. NaCl sol. and dried (MgSO4). The solvents were removed in vacuo, and the residue was purified by column chromatography (normal phase, [Biotage SNAP cartridge KP-sil 10 g, 40-63 μm, 60 Å, 12 mL per min, gradient 0% to 10% MeOH in DCM]) to give tert-butyl (4S)-4-[4-((2-methylpropyl)methylcarbamoyl)piperidin-1-yl]azepane-1-carboxylate (0.12 g, 35%) as a pale yellow gum.

Provenance & Evidence