Organo-selenium compounds S 0130Synthesis of Novel 5-Aryl-1H-tetrazoles. -Compounds of type (II), bearing selenium and tetrazole, may be used for the treatment of several diseases. -(OEZKAN, H.; YAVUZ, S.; DISLI, A.; YILDIRIR*, Y.; TUERKER, L.; Heteroat. Chem. 18 (2007) 3, 255-258; Dep. Chem., Fac. Arts Sci., Gazi Univ., Teknikokullar, TR-06500 Ankara, Turk.; Eng.) -C. Cyrus 34-178

Cycloaddition of nitrones (I) to maleimides (II) produces a diastereomeric couple of a new type of isoxazolidine derivatives.

Facile Method for 1,3-Dipolar Cycloaddition Reaction of Azomethine Ylides: Highly Stereoselective Synthesis of Substituted Pyrrolidine Derivatives. -Et2Zn-catalyzed, solvent-free 1,3-dipolar cycloaddition of azomethine ylides, derived from aldehydes (I) and glycine ester (II), with N-methylmaleimides gives pyrrolopyrrolidine derivatives (IV) with high endo-selectivity. -(YAVUZ, S.; OEZKAN, H.; TOK, G.; DISLI*, A.; J.

Organo-selenium compoundsOrgano-selenium compounds S 0130 Improved Synthesis of Phenylselenoglycolic Acids. -The diazotation of the anilinium salt (I) is carried out with ethyl nitrite in non-aqueous medium to prevent the decomposition of potassium selenocyanide. -(OEZKAN, H.; DISLI, A.; YILDIRIR*, Y.; Org.