“…In general, methylation occurs on an activated substrate such as C‐halides (Cl, Br), C‐OTf, C‐OSO 2 C 6 F 5 , and halogenated acrylates . In many cases, methylation is carried out on late‐stage intermediates, and more interestingly, owing to the excellent functional group tolerance, TMB‐mediated methylation chemistry is often published in journals relevant to medicinal chemistry, in which functional groups, such as secondary amine, oxetane, acetal, aldehyde, ketone, imidazole, aniline, thiol ether, indole, ester, and amide are often designed into pharmaceutical molecules or their corresponding intermediates.…”