A protocol for the copper-catalyzed N-methylation of sulfoximines with di-tert-butyl peroxide (DTBP) was developed. This protocol has good functional group tolerance leading to N-methylated sulfoximines in moderate to good yields. Besides, N-ethylation of sulfoximines was achieved in the presence of bis(1,1-dimethylpropyl)peroxide as the ethylating agent under a standard procedure.
F. Teng, J. Cheng and J. Yu, Org. Biomol. Chem., 2015, 13, 9934 DOI: 10.1039/C5OB01558H
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