Scheme 3. Click reactions of halogenated azidomethylsulfoxides 11 and 12 and azidophenylsulfones 14 and 15 with selected arylacetylenes 17–19 to give Group II click products 46–57. aReagents/conditions: CuSO4·5H2O/Na ascorbate/THF–H2O (2 : 1).
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