Exhaustive Reduction of Esters Enabled by Nickel Catalysis
作者:Adam Cook、Sekar Prakash、Yan-Long Zheng、Stephen G. Newman
DOI:10.1021/jacs.0c02405
日期:2020.5.6
tolyl-derivatives. This is achieved by an organosilane-mediated ester hydrosilylation reaction and subsequent Ni/NHC catalyzed hydrogenolysis. The resulting conditions provide a direct and efficient alternative to multi-step procedures for this transformation that often require use of hazardous metal hydrides. Applications in the synthesis of -CD3 containing products, derivatization of bioactive molecules, and chemoselective
我们报告了将未活化的芳基酯直接还原为其相应的甲苯基衍生物的一步程序。这是通过有机硅烷介导的酯氢化硅烷化反应和随后的 Ni/NHC 催化氢解来实现的。由此产生的条件为通常需要使用危险金属氢化物的这种转化的多步骤程序提供了一种直接有效的替代方法。展示了在合成含 -CD3 的产品、生物活性分子的衍生化以及在其他 CO 键存在下进行化学选择性还原中的应用。
Synthesis of deuterium labeled compounds by KCN-assisted hydrolysis of phosphonium salts
作者:Ka Young Lee、Jeong Eun Na、Mi Jung Lee、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2004.06.058
日期:2004.7
We developed a facile deuterium labeling method for benzylic or allylic halides or acetates systems. Conversion of the halides or acetates to the corresponding phosphoniumsalts and the following mild hydrolysis with KCN afforded the deuterium labeled compounds in good yields.
Oxygen Activated, Palladium Nanoparticle Catalyzed, Ultrafast Cross-Coupling of Organolithium Reagents
作者:Dorus Heijnen、Filippo Tosi、Carlos Vila、Marc C. A. Stuart、Philip H. Elsinga、Wiktor Szymanski、Ben L. Feringa
DOI:10.1002/anie.201700417
日期:2017.3.13
The discovery of an ultrafast cross‐coupling of alkyl‐ and aryllithium reagents with a range of aryl bromides is presented. The essential role of molecular oxygen to form the active palladium catalyst was established; palladium nanoparticles that are highly active in cross‐coupling reactions with reaction times ranging from 5 s to 5 min are thus generated in situ. High selectivities were observed for
Solvent-Switched Benzylic Methylene Functionalization: Addition, Ring-Opening, Cyclization, and Unexpected Cleavage of C–O and C–C Bonds
作者:Deng Yuan Li、Xue Song Shang、Guo Rong Chen、Pei Nian Liu
DOI:10.1021/ol401470y
日期:2013.8.2
been achieved using imines as reagents and potassium tert-butoxide as the catalyst. Depending on the solvent used, the reaction proceeds by two pathways. In THF, an addition/elimination reaction of exo-cyclic enol ethers with imines provides dihydroisobenzofuranderivatives in good yield. In DMSO, an addition/ring-opening/cyclization cascade reaction occurs with unexpected cleavage of C–O and C–C bonds
Cesium Amide‐Catalyzed Selective Deuteration of Benzylic C‐H Bonds with D
<sub>2</sub>
and Application for Tritiation of Pharmaceuticals
作者:Hui‐Zhen Du、Jun‐Zhen Fan、Zhong‐Zhen Wang、Neil A. Strotman、Haifeng Yang、Bing‐Tao Guan
DOI:10.1002/anie.202214461
日期:2023.2.13
Cesiumamide catalyst establishes a new bridge between benzylic C−H bonds and D2/T2, facilitating deuteration and tritiation of pharmaceutical compounds.
铯酰胺催化剂在苄基 C−H 键和 D 2 /T 2之间建立了新的桥梁,促进了药物化合物的氘化和氚化。