Methanamine, N-methoxy-, hydrochloride (1:1) → tert-Butyl 4-(methoxy(methyl)carbamoyl)piperidine-1-carboxylate

Participants

Reaction Steps

A mixture of 1-(tert-butoxycarbonyl)piperidine-4-carboxylic acid (9.20 g, 40.1 mmol), N,O-dimethylhydroxylamine hydrochloride (5.87 g, 60.2 mmol) and CH2Cl2 (120 mL) was treated with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (11.54 g, 60.2 mmol), N,N-diisopropylethylamine (10.51 mL, 60.2 mmol) and 4-(dimethylamino)pyridine (250 mg, 2.046 mmol) before being stirred at RT overnight. After this time, the mixture was diluted with DCM (100 mL) and washed sequentially with 1 M hydrochloric acid (2×75 mL), saturated NaHCO3 (100 mL), and brine (100 mL). The organic phase was dried (MgSO4) and then concentrated in vacuo to give tert-butyl 4-(methoxy(methyl)carbamoyl)-piperidine-1-carboxylate as a colorless oil (9.9 g), which was used in the next step without any further purification.

Provenance & Evidence