Chemoselective acylation of benzimidazoles with phenylacetic acids under different Cu catalysts to give fused five-membered N-heterocycles or tertiary amides
作者:Shaoyu Mai、Yingwei Zhao、Qiuling Song
DOI:10.1039/c6ob01167e
日期:——
bond formation via a copper-catalyzed aerobic oxidative decarboxylative tandem protocol was realized. The phenylacetic acids which contain ortho-X (X = F or Br) on the aromatic ring will render a fused five-membered heterocycle via a tandem aromatic nucleophilic substitution and aerobic oxidative decarboxylative acylation at the C(sp2)–H bond of benzimidazoles under the Cu(OAc)2/K2CO3/BF3·Et2O catalytic
通过铜催化的好氧氧化脱羧串联方案实现了C–N键的形成。在芳环上含有邻-X(X = F或Br)的苯乙酸将通过串联芳族亲核取代和苯并咪唑的C(sp 2)-H键上的好氧氧化脱羧酰化反应,形成稠合的五元杂环在Cu(OAc)2 / K 2 CO 3 / BF 3 ·Et 2 O催化体系下,以CuBr为催化剂,吡啶为碱,发生N-酰化反应,得到叔酰胺。
Synthesis of Phthalides through Tandem Rhodium-Catalyzed C-H Olefination and Annulation of Benzamides
作者:Neeraj Kumar Mishra、Jihye Park、Miji Choi、Satyasheel Sharma、Hyeim Jo、Taejoo Jeong、Sangil Han、Saegun Kim、In Su Kim
DOI:10.1002/ejoc.201600368
日期:2016.6
The rhodium(III)-catalyzed tandem C–H olefination and cyclization of benzamides with various alkenes is described. This protocol provides direct access to highly substituted phthalides, which are known as crucial frameworks of biologically active compounds. In particular, the amide directing group containing a benzimidazole group facilitates the activation of aromatic ortho-C–H bonds leading to olefination
Direct N-acylation of azoles via a metal-free catalyzed oxidative cross-coupling strategy
作者:Jingjing Zhao、Pan Li、Chungu Xia、Fuwei Li
DOI:10.1039/c4cc01587h
日期:——
The KI-catalyzed N-acylation of azoles via direct oxidative coupling of C–H and N–H bonds has been developed. It could be smoothly scaled up to gram synthesis of acyl azoles. The reaction occurred by the coupling of acyl radicals and azoles to form the acyl azole radical anion, followed by its further oxidation.
Iron(III) Chloride as a Mild Catalyst for the Dearomatizing Cyclization of <i>N</i>-Acylindoles
作者:Jingyu Zhang、Jing Li、Jas S. Ward、Khai-Nghi Truong、Kari Rissanen、Markus Albrecht
DOI:10.1021/acs.joc.0c01373
日期:2020.10.2
A catalytic approach for the preparation of indolines by dearomatizing cyclization is presented. FeCl3 acts as a catalyst to afford tetracyclic 5a,6-dihydro-12H-indolo[2,1-b][1,3]benzoxazin-12-ones in good yields. The cyclization also proceeds with tosylamides forming C–N bonds in 53% yield.
提出了一种通过脱芳香环化反应制备二氢吲哚的催化方法。FeCl 3用作催化剂,以高收率得到四环5a,6-二氢-12 H-吲哚并[ 2,1 - b ] [1,3]苯并恶嗪-12-。环化反应还会继续进行,甲苯磺酰胺以53%的收率形成C–N键。