A new synthetic approach for amide bond formation through the oxidative coupling of N,N-dialkylformamides with carboxylic acids was achieved by using a copper catalyst. Furthermore, this method was applied in the coupling of chiral amino acids in which the stereochemistry was retained in the resulting amide products.
Amides as modifiable directing groups in electrophilic borylation
作者:Saqib A. Iqbal、Marina Uzelac、Ismat Nawaz、Zhongxing Wang、T. Harri Jones、Kang Yuan、Clement R. P. Millet、Gary S. Nichol、Ghayoor Abbas Chotana、Michael J. Ingleson
DOI:10.1039/d2sc06483a
日期:——
Amide directed C–H borylation using ≥two equiv. of BBr3 forms borenium cations containing a R2N(R′)CO→B(Ar)Br unit which has significant Lewis acidity at the carbonyl carbon. This enables reduction of the amide unit to an amine using hydrosilanes. This approach can be applied sequentially in a one-pot electrophilic borylation–reduction process, which for phenyl-acetylamides generates ortho borylated
The first highly enantioselective α‐fluorination of 2‐acylimidazoles utilizing iridium catalysis has been accomplished. This transformation features mild conditions and a remarkably broad substrate scope, providing an efficient and highly enantioselective approach to obtain a wide range of fluorine‐containing 2‐acylimidazoles which are found in a variety of bioactive compounds and prodrugs. A large
Two Directing Groups Used for Metal Catalysed
<i>Meta</i>
‐C−H Functionalisation Only Effect
<i>Ortho</i>
Electrophilic C−H Borylation
作者:Saqib A. Iqbal、Clement R. P. Millet、Jürgen Pahl、Kang Yuan、Michael J. Ingleson
DOI:10.1002/ejoc.202200901
日期:2022.11.25
Two templates used in metal catalysed directed meta functionalisation led to either no borylation, or only ortho borylation under electrophilic borylation conditions. In the absence of the complex template amide directed ortho borylation onto phenylacetyl groups is shown to be possible.