Synthesis and Characterization of Some New Nitrosubstituted 3,5 - Diaryl Isoxazoles, Thio Isoxazoles and Their Derivatives

P. J. Parmar* and S. I. Rajput

*Department of Chemistry; B.P. Arts, S.M.A. Science and K.K.C. Commerce College, Chalisgaon- 424101 (India)

Chalcone dibromides (IVa-d) or flavones (Va-d) were treated with hydroxylamine hydrochloride, aqueous KOH and ethanol to give same isoxazoles (VIa-d) from both methods. Isoxazoles (VIa-d) was reacted with P2S5 in pyridine medium to give thioisoxazoles (VIIa-d). Isoxazoles (VIa-d) were treated with acetic anhydride and a pinch of anhydrous sodium acetate to give 3-(2-acetoxy)-isoxazoles (VIIIa-d). Thioisoxaziles (VIIa-d) was reacted with acetic anhydride and a pinch of anhydrous sodium acetate to give 3-(2-acetoxy)-thioisoxazoles (IX a-d).

Synthesis; Isoxazoles; Thioisoxazoles; acetyl derivatives