Phosphorus oxychloride → 4-chloro-1,3-dimethyl-1H-pyrazolo[3,4-b]quinoline

Participants

Reaction Steps

A mixture of N-(1,3-dimethyl-pyrazol-5-yl)anthranilic acid (7 g, 0.03 mol) and POCl3 (40 ml) was heated on a steam bath for 3 hours. The reaction mixture was then poured into ice-water (600 ml) and then basified with NH4H. The mixture was extracted with ether (3×200 ml) and the combined ether layers were dried over MgSO4 and evaporated to afford 7.0 g of 1,3-dimethyl-4-chloro-1H-pyrazolo[3,4-b]quinoline, m.p. 127°-129° C.

Provenance & Evidence