反应详情

The reactions of Equations 15a and 15b above can be run by procedures similar to those described in U.S. Pat. No. 3,781,438 for the preparation of 5-halo-3-phenylisoxazoles. Thus, in reaction 15a, an ethyl 2-(2-nitrobenzoyl)acetate, propionate or butyrate of Formula (XIV) is reacted with hydroxylamine hydrochloride and sodium acetate in ethanol at reflux for 0.5 to 5 hours to form a 3-(2-nitrophenyl)isoxazolin-5-one of Formula (XXVI). In reaction 15b, XXVI is reacted with an equimolar amount of triethylamine and excess phosphorus oxychloride or phosphorus oxybromide in toluene at 25° to 110° C. for 1 to 5 hours to form Xc"'.

1. temperatureat reflux for 0.5 to 5 hours