A CuO nanopowder-catalyzed coupling reaction of aryl, alkyl, and heteroaryl iodides with elemental selenium and tellurium takes place in the presence of KOH at 90 degrees C in DMSO. A wide range of substituted symmetrical diselenides and ditellurides were afforded with good to excellent yields.

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The use of organoselenium compounds in the coppercatalyzed Huisgen 1,3-dipolar cycloaddition of azido arylselenides with various alkynes is described. Arylseleno-1,2,3-triazoles are prepared in excellent yields via reaction of amino arylselenides with iso-pentylnitrite and trimethylsilyl azide, and subsequent coppercatalyzed 1,3-dipolar cycloaddition of the resulting azido arylselenides with alkynes. The cycloaddition is also performed under mild conditions with several azido arylselenides and phenylacetylene to afford the corresponding arylseleno-1,2,3-triazoles in good to excellent yields. This click chemistry protocol represents an efficient method to produce new selenium-nitrogen compounds.

0 /Base. -A wide scope of target compounds is in a simple procedure under mild conditions. -(SINGH, D.; DEOBALD, A. M.; CAMARGO, L. R. S.; TABARELLI, G.; RODRIGUES*, O. E. D.; BRAGA, A. L.; Org. Lett. 12 (2010) 15, 3288-3291,