Dipolar Cycloaddition of Novel 6-(Nitrileoxidomethyl) Penam Sulfone: An Efficient Route to a New Class of β-Lactamase Inhibitors

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Abstract
6-(Nitrileoxidomethyl) penam sulfone intermediate was prepared in a few steps starting from commercially available (+)-6-aminopenicillanic acid. This intermediate underwent smooth 1,3-dipolar cycloaddition reactions with various alkenes and alkynes to give cycloadducts in moderate to good yields. By this new method, several potent β-lactamase inhibitors were synthesized. The regio- and stereoselectivity outcomes of the cycloaddition process are also discussed.