Photocatalytic Hydrogen-Evolving Cross-Coupling of Arenes with Primary Amines
摘要:
Herein, we described a cooperative catalyst system consisting of an acridinium photoredox catalyst and a cobalt-based proton-reduction catalyst that is effective for the C-H amination of arenes with concomitant generation of hydrogen. This oxidant free method allows a variety of amines with diverse functional groups to be converted to aromatic amines. Additionally, this protocol can also be extended to hydrolytically unstable benzophenone imines.
Aluminum Hydroxide Secondary Building Units in a Metal–Organic Framework Support Earth-Abundant Metal Catalysts for Broad-Scope Organic Transformations
作者:Xuanyu Feng、Pengfei Ji、Zhe Li、Tasha Drake、Pau Oliveres、Emily Y. Chen、Yang Song、Cheng Wang、Wenbin Lin
DOI:10.1021/acscatal.9b00259
日期:2019.4.5
suggested σ-bond metathesis as a key step for the MIL-53(Al)-CoH-catalyzed addition reactions. MIL-53(Al)-FeCl competently catalyzed oxidative Csp3–H amination and Wacker-type alkene oxidation. XANES analysis revealed the oxidation of FeII to FeIII centers in the activated MIL-53(Al)-FeCl catalyst and suggested that oxidative Csp3–H amination occurs via the formation of FeIII–OtBu species by single electron
氧化铝(Al 2 O 3)表面的固有异质性对氧化铝负载的单中心非均相催化剂的开发提出了挑战,并阻碍了在分子水平上催化物种的表征以及对催化反应机理细节的阐明。 。这里,我们报告与式Al(μ在MIL-53(Al)的金属-有机骨架(MOF)的使用氢氧化铝次级结构单元的(事业部)2 -OH)(BDC)(BDC = 1,4-苯二甲酸)作为Al 2 O 3表面的均匀且在结构上定义的功能模拟物,用于负载地球富集金属(EAM)催化剂。该μ 2MIL-53(Al)SBU中的-OH基很容易去质子化,并用CoCl 2和FeCl 2金属化,从而得到MIL-53(Al)-CoCl和MIL-53(Al)-FeCl预催化剂,其特征在于粉末X射线衍射,氮吸附,元素分析,密度泛函理论和扩展X射线精细结构光谱学。用NaBEt 3 H活化将MIL-53(Al)-CoCl转化为MIL-53(Al)-CoH,可有效催化炔烃和腈的硼
Catalytic CH Amination with Aromatic Amines
作者:Raymond T. Gephart、Daria L. Huang、Mae Joanne B. Aguila、Graham Schmidt、Andi Shahu、Timothy H. Warren
DOI:10.1002/anie.201201921
日期:2012.6.25
A β‐diketiminato copper(I) catalyst enables CHamination of anilines employing low catalyst loadings to preclude oxidation to the diazene ArNNAr (see scheme). Electron‐poor anilines are particularly resistant towards diazene formation and participate in the amination of strong and unactivated CH bonds. N‐alkyl anilines also take part in CHamination.
Herein, we described a cooperative catalyst system consisting of an acridinium photoredox catalyst and a cobalt-based proton-reduction catalyst that is effective for the C-H amination of arenes with concomitant generation of hydrogen. This oxidant free method allows a variety of amines with diverse functional groups to be converted to aromatic amines. Additionally, this protocol can also be extended to hydrolytically unstable benzophenone imines.