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A novel series of 1,1a-dihydro-1-aryl-2-(3-aryl-sydnone-4-yl)-azirino[1,2-a] quinoxalines were prepared in a one-pot reaction of 2,3-dibromo-1-(3-arylsydnone-4-yl-)-3-arylpropan-1-one with o-phenylenediamine employing triethylamine in ethanol. The new compounds were well characterized by IR, 1 H NMR, mass spectra, and C,H,N analysis.

Pyrazole derivatives R 0180 Convenient Access to 1,3,4-Trisubstituted Pyrazoles Carrying 5-Nitrothiophene Moiety via 1,3-Dipolar Cycloaddition of Sydnones with Acetylenic Ketones and Their Antimicrobial Evaluation. -Compared to the standard, derivatives (VIId) and (VIIe) exhibit higher activity against all the microorganisms tested. -(RAI, N. S.; KALLURAYA*, B.; LINGAPPA, B.; SHENOY, S.; PURANIC, V. G.; Eur. J. Med. Chem. 43 (2008) 8, 1715-1720; Dep. Postgrad. Stud. Res. Chem., Mangalore Univ., Mangalagangothri, Mangalore 574 199, India; Eng.) -H. Toeppel 52-126

Novel, convenient and benign synthesis of 2-arylamino-5-(3′-arylsydnone-4-yl)-1,3,4-thiadiazines 3a-l by the interaction of 3-substituted-4-bromoacetyl sydnones 1 with substituted thiosemicarbazides 2 under MW irradiation and solvent-free condition is described.

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