the direct conversion of benzylicC-H groups to C-F. We show that visible light can activate diarylketones to abstract a benzylic hydrogen atom selectively. Adding a fluorine radical donor yields the benzylicfluoride and regenerates the catalyst. The selective formation of mono- and difluorination products can be achieved by catalyst control. 9-Fluorenone catalyzes benzylicC-H monofluorination, while
The present disclosure provides phosphatidylinositol 3-kinase (PI3K) inhibitors of formula (I),
or pharmaceutically acceptable salts thereof, in which n, m, R
1
, R
2
, and R
3
are as defined herein. These compounds are useful for treatment of conditions mediated by one or more PI3K isoforms, such as PI3Kδ. The present disclosure further provides pharmaceutical compositions that include a compound of formula (I), or pharmaceutically acceptable salts thereof, and methods of using these compounds and compositions to treat conditions mediated by one or more PI3K isoforms, such as PI3Kδ.
Transition metal-free cross-dehydrogenative arylation of unactivated benzylic C–H bonds
作者:Andrew R. A. Spencer、Rachel Grainger、Adyasha Panigrahi、Thomas J. Lepper、Katarzyna Bentkowska、Igor Larrosa
DOI:10.1039/d0cc06212j
日期:——
cross-dehydrogenative arylation of benzylic C–H bonds with arenes provides straightforward access to synthetically useful 1,1-diarylmethanes, from readily available starting materials. Current approaches suffer from limited substrate scope, requirement for large excesses of alkyl arene and/or non-trivial reaction set up. We report a transition metal-free cross-dehydrogenative arylation of benzylic C–H bonds using
Insertion of Diazo Esters into C–F Bonds toward Diastereoselective One-Carbon Elongation of Benzylic Fluorides: Unprecedented BF<sub>3</sub> Catalysis with C–F Bond Cleavage and Re-formation
作者:Fei Wang、Yoshihiro Nishimoto、Makoto Yasuda
DOI:10.1021/jacs.1c10517
日期:2021.12.15
Selective transformation of C–F bonds remains a significant goal in organic chemistry, but C–F insertion of a one-carbon-atom unit has never been established. Herein we report the BF3-catalyzed formal insertion of diazo esters as one-carbon-atom sources into C–F bonds to accomplish one-carbon elongation of benzylic fluorides. A DFT calculation study revealed that the BF3 catalyst could contribute to