Inhibition of telomerase by BIBR 1532 and related analogues
摘要:
BIBR 1532 has been reported to be a potent, small molecule inhibitor of human telomerase, suggesting it as a lead for the development of anti-telomerase therapy. We confirm the ability of BIBR 1532 to inhibit telomerase and report the discovery of an equally potent analogue. Importantly, IC50 values in cell extract are considerably higher than those previously reported using assays for purified enzyme, indicating that substantial improvement may be necessary. (C) 2003 Elsevier Science Ltd. All rights reserved.
Synthesis of ( Z )-α-chloro-α,β-unsaturated esters with complete stereoselectivity promoted by samarium diiodide
摘要:
Stereoselective beta-elimination in alpha,alpha-dichloro-beta-hydroxyesters 2 was achieved by using samarium diiodide, yielding (Z)-alpha-chloro-alpha, beta-unsaturated esters 1. The starting compounds 2 were easily prepared by reaction of the lithium enolate of ethyl dichloroacetate with different aldehydes at -78 degreesC. A mechanism to explain this process is proposed. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of dihalohydrins and tri- and tetra-substituted olefins
申请人:Board of Regents, The University of Texas System
公开号:US20040143125A1
公开(公告)日:2004-07-22
A novel synthesis reaction for highly stereospecific tri- and tetra-substituted olefins is described. A single stereoisomer of stable &agr;-halo-&agr;,&bgr;-ester is produced in high yield by the reaction of aldehyde or ketone with a trihalogenated compound such as trichloroacetate in the presence of CrCl
2
in a solvent. By varying the amount of CrCl
2
used, the stable dihalohydrin intermediate may be obtained as well.
(<i>Z</i>)-α-Haloacrylates: An Exceptionally Stereoselective Preparation via Cr(II)-Mediated Olefination of Aldehydes with Trihaloacetates
作者:D. K. Barma、Abhijit Kundu、Hongming Zhang、Charles Mioskowski、J. R. Falck
DOI:10.1021/ja029938d
日期:2003.3.1
(Z)-alpha-Fluoro-, (Z)-alpha-chloro-, and (Z)-alpha-bromoacrylates were obtained with unprecedented yield and stereocontrol (>99%) via addition of the corresponding commercial trihaloacetates to aldehydes at room temperature using stoichiometric Cr(II) salts or catalytic Cr(II) with a regeneration system. The intermediate 2,2-dihalo-3-hydroxy adducts could be isolated in good yields under conditions of limited reagent at 0 degrees C.
US7084281B2
申请人:——
公开号:US7084281B2
公开(公告)日:2006-08-01
Synthesis of ( Z )-α-chloro-α,β-unsaturated esters with complete stereoselectivity promoted by samarium diiodide
作者:José M. Concellón、Mónica Huerta、Ricardo Llavona
DOI:10.1016/j.tetlet.2004.04.101
日期:2004.6
Stereoselective beta-elimination in alpha,alpha-dichloro-beta-hydroxyesters 2 was achieved by using samarium diiodide, yielding (Z)-alpha-chloro-alpha, beta-unsaturated esters 1. The starting compounds 2 were easily prepared by reaction of the lithium enolate of ethyl dichloroacetate with different aldehydes at -78 degreesC. A mechanism to explain this process is proposed. (C) 2004 Elsevier Ltd. All rights reserved.
Inhibition of telomerase by BIBR 1532 and related analogues
作者:D.K Barma、Anissa Elayadi、J.R Falck、David R Corey
DOI:10.1016/s0960-894x(03)00101-x
日期:2003.4
BIBR 1532 has been reported to be a potent, small molecule inhibitor of human telomerase, suggesting it as a lead for the development of anti-telomerase therapy. We confirm the ability of BIBR 1532 to inhibit telomerase and report the discovery of an equally potent analogue. Importantly, IC50 values in cell extract are considerably higher than those previously reported using assays for purified enzyme, indicating that substantial improvement may be necessary. (C) 2003 Elsevier Science Ltd. All rights reserved.