eco-friendly protocol for the chemoselective protection of benzylic and primary and less hindered secondary aliphatic alcohols and phenols as trimethylsilyl ethers and different types of amines as N-tert-butylcarbamates is developed using rice husk (RiH) as the catalyst. This reagent is also able to catalyze the acetylation of alcohols, phenols, thiols and amines with acetic anhydride. Easy work-up, relatively
Microwave assisted mild, rapid, solvent-less, and catalyst-free chemoselective N-tert-butyloxycarbonylation of amines
作者:Satish N. Dighe、Hemant R. Jadhav
DOI:10.1016/j.tetlet.2012.08.089
日期:2012.10
Microwaveassisted simple, rapid, solventless, and catalyst-free chemoselective method for the protection of amino group in aromatic, aliphatic, heterocyclic, aralkyl amines, phenyl hydrazine, and amino acid esters in good to excellent isolated yield (83–98%) in short reaction time (2–12 min) has been reported.
Selective Oxidative Coupling Reaction of Isocyanides Using Peroxide as Switchable Alkylating and Alkoxylating Reagent
作者:Xinglu Zhang、Zhiqiang Liu、Yu Gao、Feng Li、Yaming Tian、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1002/adsc.201700953
日期:2018.1.17
A switchable oxidativecoupling reaction of isocyanide and peroxide has been disclosed. In the presence of iron catalyst, the coupling reaction affords N‐arylacetamides in good yields. By simply replacing the iron with copper catalyst, another different coupling reaction takes place in which peroxide can serve as alkoxylating source. This protocol represents a new fundamental coupling of two basic
Anionic Fries rearrangement of aryl carbonates. A facile route to ortho-hydroxy esters
作者:Aleksei V. Ananin、George A. Kraus
DOI:10.1016/j.tetlet.2020.152488
日期:2020.11
Aryl carbonates react with LDA or LiTMP to produce ortho-hydroxy esters.
碳酸芳基酯与LDA或LiTMP反应生成邻羟基酯。
Ligand-Promoted <i>meta</i>-C–H Amination and Alkynylation
作者:Peng Wang、Gen-Cheng Li、Pankaj Jain、Marcus E. Farmer、Jian He、Peng-Xiang Shen、Jin-Quan Yu
DOI:10.1021/jacs.6b08942
日期:2016.10.26
Using a modified norbornene (methyl bicyclo[2.2.1]hept-2-ene-2-carboxylate) as a transient mediator, meta-C-H amination and meta-C-H alkynylation of aniline and phenol substrates have been developed for the first time. Both the identification of a monoprotected 3-amino-2-hydroxypyridine/pyridone-type ligand and the use of a modified norbornene as a mediator are crucial for the realization of these