Hydroxyamine hydrochloride → sodium 1-[4-[(1R,3E)-3-hydroxyimino-3-(1-methyl-6-oxo-3-pyridinyl)-1-(2-methylphenyl)propyl]phenyl]piperidine-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a microwave vial was added (R)-1-(4-(3-(1-methyl-6-oxo-1,6-dihydropyridin-3-yl)-3-oxo-1-o-tolylpropyl)phenyl)piperidine-4-carboxylic acid (100 mg, 218 μmol), hydroxylamine hydrochloride (45.5 mg, 654 μmol) and sodium hydrogencarbonate (91.6 mg, 1.09 mmol) in ethanol (2 mL) and water (0.2 mL). The vial was capped and heated at 120° C. for 15 min, then hydroxylamine hydrochloride (45.5 mg, 654 μmol) and sodium hydrogencarbonate (91.6 mg, 1.09 mmol) were added again. The vial was capped and heated at 120° C. for 10 min, then the reaction mixture was evaporated. The residue was washed with dichloromethane, then suspended in dichloromethane/methanol 9:1 and filtered. The filtrate was concentrated and purified by chromatography (SiO2; gradient dichloromethane/methanol 19:1 to dichloro-methane/methanol 4:1) to afford the title compound (66 mg, 61%). Light brown solid, MS (ESI−): m/z=472.4 (M−H)−.

Provenance & Evidence