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 beta-lactamase inhibitors were synthesized. The regio- and stereoselectivity outcomes of the cycloaddition process are also discussed.
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Sandanayaka et al. (2000) studied this question.
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