The 4-sulfonamide-3, 5-dimethylisoxazole heterocyclic fragment is present in a number of physiologically active compounds. Thus, variously substituted derivatives of 4-[(3, 5- dimethylisoxazol-4-yl) sulfonyl] piperazine are inhibitors of metalloproteinases described as promising anticancer agents [1]. N-[(3, 5-Dimethylisoxazol-4-yl)-sulfonyl] alanines are selective integrin antagonists, potential anticoagulants [2]. Derivatives of N2-[(3, 5- ...