A Scalable and Metal-Free Synthesis of Indazoles from 2-Aminophenones and In Situ Generated De-Boc-Protected O-Mesitylsulfonyl Hydroxylamine Derivatives
Gold-catalyzed cyclization of 1-(2′-azidoaryl) propynols: synthesis of polysubstituted 4-quinolones
作者:Xiang Wu、Lang-Lang Zheng、Li-Ping Zhao、Cheng-Feng Zhu、You-Gui Li
DOI:10.1039/c9cc06652g
日期:——
An unprecedented gold-catalyzed procedure for the synthesis of polysubstituted 4-quinolones from 1-(2'-azidoaryl) propynols is described. The reaction undergoes an intramolecular nucleophilic attack of the azide group to the Au-activated triple bonds in a 6-endo-dig manner and subsequent gold-assisted expulsion of N2 to furnish an α-imino gold carbene intermediate, which triggers a 1,2-carbon migration
Copper-catalyzed tandem annulation/arylation for the synthesis of diindolylmethanes from propargylic alcohols
作者:Hui Li、Xiaoxun Li、Hao-Yuan Wang、Gabrielle N. Winston-McPherson、Hao-miao Julie Geng、Ilia A. Guzei、Weiping Tang
DOI:10.1039/c4cc05901h
日期:——
Various highly substituted 2,3′-diindolylmethane heterocycles were prepared from propargylic alcohols and indole nucleophiles via a transition metal-catalyzed tandem indole annulation/arylation reaction for the first time. Among the metal catalysts we examined, the most economical copper(I) catalyst provided the highest efficiency. The indole nucleophiles could also be replaced by other electron-rich arenes or alcohols.
[EN] AMIDE DERIVATIVES AS SIRTUIN MODULATORS<br/>[FR] DÉRIVÉS D'AMIDE COMME MODULATEURS DE SIRTUINES
申请人:SIRTRIS PHARMACEUTICALS INC
公开号:WO2009058348A1
公开(公告)日:2009-05-07
Provided herein are novel sirtuin-modulating compounds represented by Structural Formula (I) and methods of use thereof. The sirtuin-modulating compounds may be used for increasing the lifespan of a cell, and treating and/or preventing a wide variety of diseases and disorders including, for example, diseases or disorders related to aging or stress, diabetes, obesity, neurodegenerative diseases, cardiovascular disease, blood clotting disorders, inflammation, cancer, and/or flushing as well as diseases or disorders that would benfit from increased mitochondrial activity. Also provided are compositions comprising a sirtuin- modulating compound in combination with another therapeutic agent.
Divergent Reactivity of Rhodium(I) Carbenes Derived from Indole Annulations
作者:Xiaoxun Li、Hui Li、Wangze Song、Po‐Sen Tseng、Lingyan Liu、Ilia A. Guzei、Weiping Tang
DOI:10.1002/anie.201505329
日期:2015.10.26
carbenes were generated from propargylic alcohol derivatives as the result of a dehydrative indole annulation. Depending on the choice of the electron‐withdrawing group on the aniline nitrogen nucleophile, either a cyclopropanation product or dimerization product was obtained chemoselectively. Intramolecular hydroamidation occurred for the same type of propargylic alcohol derivatives when other transition‐metal
readily available enol nucleophiles by copper-catalyzed tandem annulation/enol nucleophilic addition has been developed. Compared to the expensive metal catalysts such as platinum, gold, silver, and palladium used previously, the most economical copper(I) catalyst could achieve this reaction efficiently. The fused heterocyclic compounds, pyrrolo[1,2-a] indoles, could be afforded by further transformation
已经开发了通过铜催化的串联环化/烯醇亲核加成从炔丙醇和容易获得的烯醇亲核体中获得各种多取代的吲哚的方法。与以前使用的昂贵的金属催化剂(例如铂,金,银和钯)相比,最经济的铜(I)催化剂可以有效地实现该反应。可以通过进一步转化产物来提供稠合的杂环化合物吡咯并[1,2- a ]吲哚。烯丙基阳离子中间体可能与该机理有关。