Synthesis of combretastatin A-4 O-alkyl derivatives and evaluation of their cytotoxic, antiangiogenic and antitelomerase activity
作者:Sandra Torijano-Gutiérrez、Santiago Díaz-Oltra、Eva Falomir、Juan Murga、Miguel Carda、J. Alberto Marco
DOI:10.1016/j.bmc.2013.09.064
日期:2013.12
compounds were found to have an activity comparable or higher than that of combretastatinA-4 in at least one of the aforementioned biological properties. The compounds with the (E)-arylalkene fragment were in general terms more active than the simple O-alkyl derivatives. However, no clear structure/activity correlations were perceived when comparing the observed compound activities across the three biological
Use of piperazine and homopiperazine compounds for the inhibition of cellular adhesion and infiltration
申请人:KOWA CO. LTD.
公开号:EP0774257A2
公开(公告)日:1997-05-21
The present invention is directed to a cell adhesion inhibitory agent, cellular infiltration inhibitory agent, antiallergic agent, antiasthmatic agent, and antiphlogistic, which contains a compound of the following formula (1):
wherein each of R1 through R6 represents H, a halogen atom, a hydroxyl group, a lower alkyl group, or a lower alkoxy group, m represents a number of 1 from 3 inclusive, and n represents 2 or 3.
Orthogonally Protected 1,2-Diols from Electron-Rich Alkenes Using Metal-Free Olefin <i>syn</i>-Dihydroxylation
作者:Ignacio Colomer、Rosimeire Coura Barcelos、Kirsten E. Christensen、Timothy J. Donohoe
DOI:10.1021/acs.orglett.6b02959
日期:2016.11.18
A new method for the stereoselective metal-free syn-dihydroxylation of electron-richolefins is reported, involving reaction with TEMPO/IBX in trifluoroethanol (TFE) or hexafluoroisopropanol (HFIP) and the addition of a suitable nucleophile. Orthogonally protected syn 1,2-diols were obtained with high levels of diastereocontrol, and these products were selectively deprotected and selectively functionalized
Stereoselective synthesis of bicyclic cyclopentanones was achieved by sequential Tf2O-catalyzed decarboxylation and intramolecular [3 + 2] cycloaddition reactions of cyclic enol carbonates bearing an alkene unit. Four stereogenic centers in the obtained cyclopentanone were stereoselectively constructed. This method could be applied to the synthesis of various fused bicyclic products in moderate-to-good