Sodium Nitrite → HCID 24959703, compound

Participants

Reaction Conditions

Reaction Steps

2-[4-(5-amino-2,4-dimethoxy-[1,6]naphthyridin-7-yl)-2,6-dimethyl-phenoxyl]-ethanol (0.302 g, 0.82 mmol) in water (5 mL) and conc. Hydrochloric acid (3 mL) were mixed with stirring. The reaction mixture was cooled to 0° C. and a solution of sodium nitrite (0.305 g, 4.42 mmol) in water (3 mL) was added dropwise. The reaction mixture was stirred at 0° C. for 40 min. To the reaction mixture was added 1 N hydrochloric acid (10 mL) and heated at 55° C. for 50 min and then stirred at room temperature overnight. The reaction mixture was extracted with dichloromethane and the aqueous layer was basified with aqueous 5% NaOH and saturated NaHCO3 solution. Water was evaporated and the organic compound was washed with a dichloromethane/methanol solution and concentrated to leave a crude which was purified by silica gel (50 g) column chromatography, employing 50% ethyl acetate in hexane and hexane/ethyl acetate/methanol (3:2:1) as eluent, to obtain 7-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)-2,4-dimethoxy-1,6-naphthyridin-5(6H)-one (0.080 g, 26%). Selected data: MS (ES) m/z: 371.1; MP 224.9-225.4° C.

Provenance & Evidence