Replacement of Stoichiometric DDQ with a Low Potential <i>o</i>-Quinone Catalyst Enabling Aerobic Dehydrogenation of Tertiary Indolines in Pharmaceutical Intermediates
作者:Bao Li、Alison E. Wendlandt、Shannon S. Stahl
DOI:10.1021/acs.orglett.9b00111
日期:2019.2.15
(phd = 1,10-phenanthroline-5,6-dione), is shown to be effective for aerobic dehydrogenation of 3° indolines to the corresponding indoles. The results show how low potential quinones may be tailored to provide a catalytic alternative to stoichiometric DDQ, due to their ability to mediate efficient substrate dehydrogenation while also being compatible with facile reoxidation by O2. The utility of the
Cationic [(Iminophosphine)Nickel(Allyl)]<sup>+</sup>Complexes as the First Example of Nickel Catalysts for Direct Hydroamination of Allenes
作者:Hosein Tafazolian、Joseph A. R. Schmidt
DOI:10.1002/chem.201605611
日期:2017.1.31
The first example of nickel‐catalyzed hydroamination of allenes is reported. The new cationic [(3‐iminophosphine)nickel(allyl)]+ catalysts have been fully characterized and act regioselectively in the catalytic hydroamination of allenes with secondary amines at room temperature.
Access to <i>gem</i>-Difluoro Olefins via C–H Functionalization and Dual Role of Anilines
作者:Zhen Yang、Chao Pei、Rene M. Koenigs
DOI:10.1021/acs.orglett.0c02568
日期:2020.9.18
In this Letter, we describe a simple, practical approach in which cheap CuI was used as a catalyst to introduce a gem-difluoro olefin onto simple electron-rich aniline derivatives in good yield via direct C–H functionalization and a subsequent HF elimination reaction. Detailed mechanistic studies point at a dual role of aniline derivatives in this reaction, which serve as a substrate and a basic promoter
Electrochemical dehydrogenative cross-coupling of two anilines: facile synthesis of unsymmetrical biaryls
作者:Mu-Jia Luo、Yang Li、Xuan-Hui Ouyang、Jin-Heng Li、De-Liang He
DOI:10.1039/c9cc09879h
日期:——
A new, general ortho/para-selective anodic dehydrogenative cross-coupling of two aryl amines, naphthalen-2-amine derivatives and anilines, is described. This electrochemical protocol assembles a wide range of unsymmetrical biaryls in good to excellent yields under mild, additional-metal-catalyst-free, oxidant-free conditions with excellent selectivity, broad substrate scope, and wide functional group
Mechanochemical Nucleophilic Substitution of Alcohols via Isouronium Intermediates**
作者:Tatsiana Dalidovich、Jagadeesh Varma Nallaparaju、Tatsiana Shalima、Riina Aav、Dzmitry G. Kananovich
DOI:10.1002/cssc.202102286
日期:2022.2.8
Greener amine synthesis: Nucleophilicsubstitution of alcohols via reactive isouronium salts under mechanochemical one-jar reaction conditions is presented for the first time. The method opens access towards biologically active amines, including active pharmaceutical ingredients.