Ultimately upon addition of MesMgBr, 1-Mes can be isolated in 76% yield via this approach. Note the borylation of amineboranes (e.g. 3-Br) cannot be performed by adding one portion of excess PhSiMe3 at the start of the reaction, as HNTf2 reacts rapidly with PhSiMe3, thus this combination instead produces benzene, the aminoborane (4-Br) and Me3SiNTf2. Note, the latter two combined do not react to generate a boron electrophile able to effect C-H borylation and form 1-Br. Scheme 3: Me3SiNTf2 mediated, N-directed, C-H borylation (termed route ii).