Metal-Free Selective Borylation of Arenes by a Diazadiborinine via C–H/C–F Bond Activation and Dearomatization
datasetposted on 22.08.2019, 16:04 by Yuanting Su, Dinh Cao Huan Do, Yongxin Li, Rei Kinjo
A newly developed annulated 5-chlorinated 1,3,2,5-diazadiborinine derivative (4) selectively activates a C–H bond of benzene (C6H6) and 1,3-di(trifluoromethyl)benzene, as well as a C–F bond in partially fluorinated arenes, to furnish borylation products under catalyst-, metal-, and irradiation-free conditions. Moreover, 4 readily undergoes a reversible dearomative coupling reaction with polycyclic aromatic hydrocarbons to afford diboration products. The latter represents the first reversible intermolecular dearomative diboration of arenes.