asymmetric synthesis of enantiopure pyrrolidines is reported via a streamlined strategy relying on two sequential C−H functionalizations of simple hydrocarbons. The first step is a regio- and stereoselective catalytic nitrene C−H insertion. Then, a subsequent diastereoselective cyclization involving a 1,5-hydrogen atom transfer (HAT) from a N-centered radical leads to the formation of pyrrolidines that can
Electrocatalytic Oxidative Cleavage of Electron-Deficient Substituted Stilbenes in Acetonitrile−Water Employing a New High Oxidation Potential Electrocatalyst. An Electrochemical Equivalent of Ozonolysis
作者:Xin Wu、Anthony P. Davis、Albert J. Fry
DOI:10.1021/ol7026416
日期:2007.12.1
A series of symmetrical and unsymmetrical stilbenes bearing two or more strong electron-withdrawing groups were oxidatively cleaved to the corresponding aldehydes in high yield by electrocatalytic anodic oxidation in aqueous acetonitrile employing a new high oxidation potential triphenylamine electrocatalyst. The oxidations apparently involve the corresponding 1,2-diols, which are also converted to aldehydes in high yield under the same conditions.
Synthesis and bio-evaluation of novel quinolino-stilbene derivatives as potential anticancer agents
作者:Vandana Srivastava、Hoyun Lee
DOI:10.1016/j.bmc.2015.11.007
日期:2015.12
A series of 25 novel quinolino-stilbene derivatives were designed, synthesized and evaluated for their potential as anticancer agents. Three of them not only displayed quite potent antiproliferative activity with IC50 values <4 mu M but also showed approximately twofold selectivity against cancer cells, compared to non-cancerous cells. Three other compounds exhibited comparatively good activity with IC50 values in the range of 4-10 mu M, and the rest was moderately active or inactive. One of these viz. 3-[E-(4-fluorostyryl)]-2-chloroquinoline (compound 7B) caused substantial DNA damage and arrested cell cycle in S phase. Interestingly, 7B was very active against MDA-MB468 (IC50 = 0.12 mu M), but not against other cell lines examined. Compound 3-[Z-(3-(trifluoromethyl)styryl)]-2-chloroquinoline (12A), the most effective against all cancer cell lines examined, caused prolonged cell cycle arrest at mitosis and eventually apoptosis. Data from an in vitro study showed that compound 12A inhibited microtubule polymerization in a similar fashion to nocodazole. Further study using in silico molecular modeling revealed that 12A causes the impediment of microtubule polymerization by binding to tubulin at the same cavity where podophyllotoxin binds. (c) 2015 Elsevier Ltd. All rights reserved.