A regioselective synthesis of 3,5-disubstituted isoxazoles

Abstract
The 3-aryl-5- and 5-aryl-3-(phenylsulphonylmethyl)isoxazoles (6) and (9) respectively were regio-selectively prepared from 1-aryl-3-methylthio-4-phenylsulphonylbut-2-en-1-one (1). As an application of the present method, 3-methyl-5-(4-pyridyl)isoxazole (2) was also synthesized from compound (1). The reaction of compound (1) with guanidine led to 2-amino-4-phenyl-6-(phenylsulphonylmethyl)-pyrimidine (3).

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