The preparation of 2,6-disubstituted pyridinyl phosphine oxides as novel anti-cancer agents
作者:Kim Hung Lam、Roberto Gambari、Marcus Chun Wah Yuen、Chi Wai Kan、Penni Chan、Lijin Xu、Weijun Tang、Chung Hin Chui、Gregory Yin Ming Cheng、Raymond Siu Ming Wong、Fung Yi Lau、Cindy Sze Wai Tong、Andrew Kit Wah Chan、Paul Bo San Lai、Stanton Hon Lung Kok、Chor Hing Cheng、Albert Sun Chi Chan、Johnny Cheuk On Tang
DOI:10.1016/j.bmcl.2009.02.091
日期:2009.4
A series of 2,6-dimethoxylpyridinyl phosphine oxides have been synthesized and examined for their antitumor activity. 2,6-Dimethoxy-3-phenyl-4-diphenylphosphinoylpyridine 2 has been employed as the lead compound for this study. We found out that the presence of phosphine oxide on the 2,6-dimethoxylpyridine ring is important for the antitumor activity; the presence of bromine on this core leads to a
Chiral pyridylphosphines and their application in asymmetric catalytic
申请人:The Hong Kong Polytechnic University
公开号:US05886182A1
公开(公告)日:1999-03-23
Novel, optically active phosphorous compounds of the formula, ##STR1## wherein R.sup.1 represents hydrogen atoms, straight or branched-chain alkyl groups having from 1 to 6 carbon atoms, R.sup.2 represents hydrogen atoms, halogen atoms, lower alkyl groups (1 to 6 carbon atoms), lower alkoxy groups (1 to 6 carbon atoms), hydroxy group, chiral hydroxyalkyl groups, and amino groups (1.degree., 2.degree., 3.degree.) vinyl groups or allyl groups and R.sup.3 represents phenyl groups, aryl groups, cyclohexyl groups, substituted and unsubstituted cycloalkyl groups, heteroaromatic rings, are described. The compounds of the formula serve as highly useful ligands in the preparation of ruthenium complexes which are effective catalysts for the asymmetric hydrogenation of 2-arylpropenoic acids leading to high valued 2-arylpropionic acids.
different alkene affords unsymmetrical, multi-substituted pyridine derivatives. Mechanistic studies indicate that the reaction proceeds via electrophilic thallation of heteroarenes followed by Pd-catalyzed Heck-type reaction. The utility of this method is showcased by its application to the late-stage functionalization of structurally complex bioactive molecules having 2,6-dialkoxypyridine as a core