We first report the direct ortho C–Hamidation of arenes with azides by using a novel and inexpensive RuHCl(CO)(PPh3)3 catalyst. The reaction proceeds efficiently in high yield over a broad range of substrates without requirement of any additional silver salt or additive.
Chelation-Assisted Rhodium-Catalyzed Direct Amidation with Amidobenziodoxolones: C(sp<sup>2</sup>)–H, C(sp<sup>3</sup>)–H, and Late-Stage Functionalizations
作者:Xu-Hong Hu、Xiao-Fei Yang、Teck-Peng Loh
DOI:10.1021/acscatal.6b02015
日期:2016.9.2
Air-stable and convenient amidobenziodoxolones as an amidating reagent were disclosed to enable direct amidation on a wide range of C(sp2)–H bonds of (hetero)arenes and alkenes, as well as unactivated C(sp3)–H bonds under RhIII catalysis. The approach to access 49 examples of structurally diverse amides is featured by mild conditions, complete chemoselectivity and regioselectivity, broad substrate scope
Rhodium(III)-Catalyzed Intermolecular N-Chelator-Directed Aromatic C–H Amidation with Amides
作者:Huaiqing Zhao、Yaping Shang、Weiping Su
DOI:10.1021/ol4024776
日期:2013.10.4
Rh(III)-catalyzed intermolecular direct aromatic C–H bond amidation with amides has been accomplished under mild reaction conditions. This protocol is applicable to a broad range of N-chelator-containing arenes amidated with aromatic and aliphatic sulfonamides. A possible mechanism is proposed according to the experimental results.
Mechanism of C−F Reductive Elimination from Palladium(IV) Fluorides
作者:Takeru Furuya、Diego Benitez、Ekaterina Tkatchouk、Alexandra E. Strom、Pingping Tang、William A. Goddard、Tobias Ritter
DOI:10.1021/ja909371t
日期:2010.3.24
mechanism study of C-F reductiveeliminationfrom a transition metal complex is described. C-F bond formation from three different Pd(IV) fluoride complexes was mechanistically evaluated. The experimental data suggest that reductiveelimination occurs from cationic Pd(IV) fluoride complexes via a dissociative mechanism. The ancillary pyridyl-sulfonamide ligand plays a crucial role for C-F reductive elimination
A copper-catalyzed C-H amidation process, with azides as amino sources under oxidant-free conditions, has been developed. When N-heterocycles were employed as directing groups, sulfonylazide and benzoylazide could be used as amidating reagents to provide corresponding N-arylamides. When amidines or imine were used, tandem C-N/N-N bond formation occurred to afford indazole derivatives in one pot.