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The reaction of precursors 3 with NBS in radical conditions does not yield any azetidine resulting from a 4-exo radical cyclisation with bromine atom transfer, or any brominated product at the glycinyl position. Instead, dibrominated adducts 4 and aminals 5 have been formed in good yields. We have investigated the mechanism of this puzzling transformation and shown that the homolytic abstraction of...
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