[reaction: see text] Various ene-tosylynamides react with platinum(II) chloride and lead to bicyclic nitrogenated heterocycles. This unprecedented and easily operated process can be coupled with a hydrolysis of the intermediate cyclic tosylenamides in a one-pot transformation, which provides cyclobutanones.
8-Endo Cyclization of (Alkoxycarbonyl)methyl Radicals: Radical Ways for Preparation of Eight-Membered-Ring Lactones
作者:Eun Lee、Cheol Hwan Yoon、Tae Hee Lee、Sun Young Kim、Tae Joon Ha、Yong-suk Sung、Sang-Hyun Park、Sangyoub Lee
DOI:10.1021/ja980908d
日期:1998.8.1
Cyclization of (alkoxycarbonyl)methyl radicals generated from bromoacetates proceeds in the 8-endo mode to generate heptanolactones. Three distinct types of 8-endo/5-exo tandem radical cyclizations produce different bicyclic heptanolactones. In certain cases, intramolecularfree-radical attack on the heptanolactone carbonyl group initiates further skeletal rearrangement. Ab initio calculations indicate
[EN] LUPANE TRITERPENOID DERIVATIVES AND PHARMACEUTICAL USE THEREOF<br/>[FR] DÉRIVÉS DE TRITERPÉNOÏDES DE LUPANE ET LEUR UTILISATION PHARMACEUTIQUE
申请人:JIANGXI QINGFENG PHARMACEUTICAL INC
公开号:WO2013117137A1
公开(公告)日:2013-08-15
Disclosed are lupane triterpenoid derivatives and pharmaceutical use thereof, specifically lupane triterpenoid derivatives of formulae (I)~(III), a pharmaceutical composition and a combination preparation comprising said lupane triterpenoid derivatives or a pharmaceutically acceptable salt thereof in a therapeutically-effective dose, particularly the use in preparation of a medicament for the treatment of HIV-1/AIDS.
Sulfur compounds as inhibitors of Hepatitis C virus NS3 serine protease
申请人:Bennett Frank
公开号:US20070042968A1
公开(公告)日:2007-02-22
The present invention discloses novel compounds which have HCV protease inhibitory activity as well as methods for preparing such compounds. In another embodiment, the invention discloses pharmaceutical compositions comprising such compounds as well as methods of using them to treat disorders associated with the HCV protease.
Oxidative cyclization of 4-penten-1-ols using a Pd catalyst and n-BuONO or n-BuONO/p-benzoquinone afforded 3-hydroxy- and 3-methoxytetrahydropyrans via terminal selective nucleophilic attack. The radicals formed from n-BuONO and O2 operate as critical oxidants and ligands for Pd.