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A novel method for the oxidative radical azidation of alkenes relies on an azide in combination with a hypervalent iodine reagent. A cascade of CN and CC bond-forming reactions yields 2-oxindoles under metal-free conditions with high reaction rates at ambient temperature and provides access to complex products (see scheme; TMS=trimethylsilyl).
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Matcha et al. (2013) studied this question.
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