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A late‐stage 18O labeling approach of sulfonamides that employs the corresponding unlabeled molecule as the starting material was developed. Upon deamination of the sulfonamide, a sulfinate intermediate was isotopically enriched using eco‐friendly reagents H218O and 15NH3(aq) to afford a M+5 isotopologue of the parent compound. This degradation–reconstruction approach afforded isolated yields of up...
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