Citric Acid → HCID 178483292、化合物

To 3-chloro-5-cyanobenzyl carbonochloridate (step 4) (65.5 mg, 0.285 mmol) and N-methyl-N-(2-(piperidin-4-yl)ethyl)-1H-1,2,3-triazole-4-carboxamide (step 3) (78 mg, 0.285 mmol) in DCM (5 mL) was added saturated aqueous sodium bicarbonate solution (5 mL, 0.285 mmol), and the mixture stirred vigorously for 16 hrs. The resulting mixture was acidified with 10% citric acid solution and the organic portion was separated, dried (MgSO4) and concentrated under reduced pressure. The residue was dissolved in DCM and applied to a 12 g silica cartridge eluting with 0-100% EtOAc/iso-hexane. The product fractions were combined and concentrated to give a gum. This was further purified by UV triggered HPLC, to give 3-chloro-5-cyanobenzyl 4-(2-(N-methyl-1H-1,2,3-triazole-4-carboxamido)ethyl)piperidine-1-carboxylate as a gum;