C−H Activation Based Copper‐Catalyzed One‐Shot Synthesis of N,O‐Bidentate Organic Difluoroboron Complexes
Guangying Tan, Malte L. Schrader, Constantin G. Daniliuc, Felix Strieth‐Kalthoff, Frank Glorius
Abstract
Abstract Organic BF 2 complexes exhibit characteristics such as large Stokes shift, high quantum yield, strong emission intensity, and robust chemical stability, thereby being extensively used in various applications. Herein, we disclose a novel copper‐catalyzed cascade C−H activation/acyloxylation and difluoroboronation of 2‐phenylpyridine derivatives, thus providing a straightforward and rapid gateway to a series of N,O‐bidentate organic BF 2 complexes with excellent photophysical properties. Mechanism studies demonstrate that AgBF 4 services as BF 2 source and oxidant for this elegant transformation. Most of these BF 2 complexes have broad and intense absorption and emission bands, and display bright and intensive blue fluorescence as well as large Stokes shifts.