Iodine catalyzed synthesis of 2,5-substituted oxazoles from N-arylethylamides through intramolecular C(sp3)–H functionalization under metal-free conditions is described.
coupling of azine N-oxides and oxazoles has been developed. The C–C bond-forming process proceeds, accompanied by the removal of the oxygen atom from the azine core, to directly afford the azine–oxazole biaryl linkage. Moreover, this system requires no noble transition metals such as palladium and rhodium, which are common promotors in the related dehydrogenative couplings with the azine N-oxide. Thus, the
CYCLOMETALATED TRANSITION METAL COMPLEXES FOR MULTIPLEX ANALYTE DETECTION
申请人:Berkelman Thomas R.
公开号:US20100144046A1
公开(公告)日:2010-06-10
A complex containing a transition metal ion and a plurality of donor ligands each of which is fully coordinated to the transition metal ion and is either a nitrogen donor ligand or a cyclometalated donor ligand, such that at least one of the donor ligands is a cyclometalated donor ligand bears one or more reactive groups connected to at least one of the donor ligands through a linker that includes a chain of four or more atoms. The linker offers advantages that make the complex particularly effective in labeling biomolecules and in multiplex analyses.
Electrochemical construction of 2,5-diaryloxazoles via N–H and C(sp3)-H functionalization
作者:Tong Li、Leping Pan、Yan Zhang、Jihu Su、Kai Li、Kuiliang Li、Hu Chen、Qi Sun、Zhiyong Wang
DOI:10.1016/j.cclet.2023.108897
日期:2024.4
An efficient NH and C(sp)-H functionalization of aryl ketones with benzylamines/amino acids was developed under mild conditions by virtue of anodic oxidation. A variety of functionalized 2,5-diaryloxazoles were obtained with good to excellent yields. Moreover, some important natural products can be prepared by this method. The reaction features a broad substrate scope, scalability, metal-free and chemical
The direct C-H bond arylation of (benzo)oxazoles with aryl chlorides was achieved catalyzed by a well-defined NHC-Pd(II)-Im complex. Under the optimal conditions, various aryl chlorides were successfully applied as the arylating reagents to achieve the 2-aryl (benzo)oxazoles in acceptable to high yields, providing a convenient and alternative method for the direct C-H bond arylation of (benzo)oxazoles and enriching the chemistry of the NHC-Pd(II) complex in organic synthesis.