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: Aromatic aldoximes 1a-i undergo oxidative dehydrogenation with CrO 2 to give nitrile oxides, which are trapped in situ by 4-methoxycinnamonitrile 2 to afford of ethyl 3,5-diaryl-4,5-dihydroisoxazole-4-carbonitriles 3a-i in good yield . Key words : Isoxazoles, isoxazolines, magtreive TM , antimicrobial, antioxidant. I. Introduction Isoxazoles and isoxazolines are very useful heterocycles in organic and heterocyclic chemistry [1]. Isoxazolines also serves as important building blocks for the synthesis of various biologically active molecules [2]. The isoxazoles are known to exhibit significant number of biological applications such as hypoglycemic, analgesic, anti-inflammatory and HIV-inhibitory activity [3], also found to exhibit antibacterial [4], antifungal [5], antioxidant [6], potent selective agonists at human cloned dopamine D4 receptors [7], COX-2 inhibitory [8], antinociceptive [9], anticancer [10], and antibiotic, antitumour, insecticidal activities [1,2]. They serve as prodrug for the anti-arithretic agent [11]. Vijay V. Dabholkar and co-workers [12] reported the synthesis and their antimicrobial activity of fused isoxazolines. Joshi and et al [13] reported that isoxazoles acts as potential antitubercular agents. The most convenient synthesis of isoxazoline and isoxazole ring system has been executed in the literature via 1, 3-dipolar cycloaddition reactions of alkenes and alkynes with nitrile oxides generated

Synthesis of New 3, 5-Diaryl-4, 5-Dihydroisoxazole-4- Carbonitriles via 1, 3-Dipolar Cycloaddition Reaction