Air‐Stable Carbonyl(pentamethylcyclopentadienyl)cobalt Diiodide Complex as a Precursor for Cationic (Pentamethylcyclopentadienyl)cobalt(III) Catalysis: Application for Directed C‐2 Selective CH Amidation of Indoles
dienyl)cobalt diiodide complex [Cp*Co(CO)I2] was successfully utilized as the precursor of a cationic cobalt(III) active catalyst for directed CH bond functionalization. The complex Cp*Co(CO)I2 (2.5–1.25 mol%), in combination with silver hexafluoroantimonate (AgSbF6) and potassium acetate (KOAc), efficiently catalyzed the directed C‐2 selective amidation of indoles with sulfonyl azides, and the corresponding
Manganese-Catalyzed C−H Amidation of Heteroarenes in Water
作者:Xianqiang Kong、Long Lin、Bo Xu
DOI:10.1002/adsc.201800544
日期:2018.8.6
We have developed an efficient manganese‐catalyzed amidation of various heteroarenes via C−H bond activation using readily available sulfonyl azides. The key step is heteroarene directed electrophilic aromatic metalation using MnBr(CO)5 as catalyst. This method offers excellent chemical yields and regioselectivity with good functional group tolerance. This base metal catalyzed reaction proceeds efficiently
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
Dibenzothiophenesulfilimines: A Convenient Approach to Intermolecular Rhodium‐Catalysed C−H Amidation
作者:Patrick W. Antoni、Alexandra V. Mackenroth、Florian F. Mulks、Matthias Rudolph、Günter Helmchen、A. Stephen K. Hashmi
DOI:10.1002/chem.202002371
日期:2020.7.2
transition‐metal‐catalysedC−Hamidation procedure is reported. Dibenzothiophene‐based sulfilimines were shown to constitute a class of novel amidation reagents which enable the transfer of a wide range of N‐sulfonyl and N‐acyl moieties. It was demonstrated that sulfilimines, which are easily accessible from cheap reagents, are safe‐to‐handle and represent broadly applicable amidation reagents. The dibenzothiophene