m-Chloroperbenzoic acid → 4-methoxy-6-(4-methoxybenzyl)-N,N-dimethyl-5-oxo-5,6,7,8-tetrahydro-2,6-naphthyridine-1-carboxamide 2-oxide

Participants

Reaction Steps

A 100 ml CH2Cl2 solution of 12 g 4-methoxy-6-(4-methoxybenzyl)-N,N-dimethyl-5-oxo-5,6,7,8-tetrahydro-2,6-naphthyridine-1-carboxamide and 16.8 g mCPBA (maximum 77% purity) was allowed to stir at room temperature until the starting material was consumed (5 hours). The reaction was washed four times with 100 mL sat aqueous NaHCO3 then the organic layer was concentrated. The crude reaction was dissolved in 250 mL CH2Cl2 and the excess mCPBA was then quenched by vigorous stirring with a sat aq sodium sulfite solution for 30 minutes (both organic and aqueous layers were cloudy initially but then turned transparent). The layers were separated and the organic washed twice with sat aqueous NaHCO3. The organic layer was dried over sodium sulfate and concentrated to pure product by HPLC/MS and NMR.

Provenance & Evidence