Metal-Free Catalytic Approach for Allylic C–H Amination Using <i>N</i>-Heterocycles via sp<sup>3</sup> C–H Bond Activation
作者:Jinwei Sun、Yi Wang、Yi Pan
DOI:10.1021/acs.joc.5b01383
日期:2015.9.18
A versatile metal-free synthesis of allylic N-heterocycles has been developed using a TBAI/TBHP oxidation system. This general protocol could be applied for the C–N bond formation of electron-deficient phthalimides, imidazoles, triazoles, and sulfonamides with cyclic and acylic olefins. The practical use of the method is demonstrated by the amidation of functionalized biologically active substrates
The unique property of hexafluoroisopropanol (HFIP) enables the regioselective hydroamination of 1,3-dienes with nitrogen heterocycles in a Markovnikov manner in the presence of catalytic Brønsted acid. This transition-metal-free intermolecular hydroamination protocol is achieved under mild reaction conditions. The aggregation by HFIP and Brønsted acid helps to activate the terminal double bond regioselectively
Allylic Amination via Decarboxylative C-N Bond Formation
作者:Jon A. Tunge、Shelli R. Mellegaard-Waetzig、Dinesh Kumar Rayabarapu
DOI:10.1055/s-2005-918949
日期:——
This manuscript details the development of a palladium-catalyzed allylic amination that proceeds via decarboxylation of allylic carbamates. Both saturated and aromatic heterocycles undergo decarboxylative rearrangement in good yields. The mechanism of allylation of heteroaromatic amines involves the formation of Ï-allyl palladium complexes followed by decarboxylation of the carbamate. Finally, the heteroaromatic anion equivalent is allylated to provide allylic amines.
Amidoselenation and Amidotelluration of Alkenes using Oxygen as Terminal Oxidant
作者:Kai Sun、Xin Wang、Chong Zhang、Saifei Zhang、Yao Chen、Hezhen Jiao、Weimin Du
DOI:10.1002/asia.201700017
日期:2017.3.16
conditions. This method provides a simple route to a series of structurally diverse β‐amido selenides and β‐amido tellurides in moderate to high yields. The wide substrate scope, good functional group tolerance, ease of large‐scale preparation and potential for product derivatization make this reaction attractive for the synthesis of nitrogen‐, selenium‐ and tellurium‐containing molecules.