We report the direct amidation of arene C-H bonds using sulfonyl azides as the amino source to release N(2) as the single byproduct. The reaction is catalyzed by a cationic rhodium complex under external oxidant-free conditions in the atmospheric environment. A broad range of chelate group-containing arenes are selectively amidated with excellent functional group tolerance, thus opening a new avenue
Ruthenium-Catalyzed Direct CH Amidation of Arenes Including Weakly Coordinating Aromatic Ketones
作者:Jiyu Kim、Jinwoo Kim、Sukbok Chang
DOI:10.1002/chem.201301025
日期:2013.6.3
CH activation: The ruthenium‐catalyzed direct sp2 CHamidation of arenes by using sulfonyl azides as the amino source is presented (see scheme). A wide range of substrates were readily amidated including arenes bearing weakly coordinating groups. Synthetic utility of the thus obtained products was demonstrated in the preparation of biologically active heterocycles.
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.
Rhodium‐Catalyzed C−H Activation Enabled by an Indium Metalloligand
作者:Ryosuke Yamada、Nobuharu Iwasawa、Jun Takaya
DOI:10.1002/anie.201910197
日期:2019.11.25
Rhodium complexes with an indiummetalloligand were successfully synthesized by utilizing a pyridine-tethered cyclopentadienyl ligand as a support for an In-Rh bond. The indiummetalloligand dramatically changes the electronic and redox properties of the rhodium metal, thereby enabling catalysis of sp2 C-H bond activation.
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