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Microwave activation coupled with Cu(I) catalysis, under solvent-free conditions, was found to dramatically enhance the 1,3-dipolar cycloaddition between azido-2′-deoxyribose and terminal alkynes. The process is highly efficient and quantitatively affords, in few minutes, the corresponding 4-substituted 1,2,3-triazolyl-nucleosides.
Novel isoxazolines and isoxazoles of N-substituted saccharin derivatives are synthesized in good yields by 1,3-dipolar cycloaddition of N-allyl or propargyl N-substituted saccharin with arylnitrile oxide under solvent-free microwave irradiation. In this process, the yields were significantly improved over conventional heating, without alteration of the selectivity. The regioselectivity as well as...
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