Z-芳基二甲基(1),甲基苯基(2)和联苯(3)与X-苯胺的次膦酸盐二甲基亚砜在60.0°C下进行了动力学研究。动力学结果产生基本法线氘 涉及氘的动力学同位素效应(DKIE) 苯胺 (XC 6 H 4 ND 2)亲核试剂k H / k D = 1.03-1.17、1.15-1.29和1.24-1.51,以及交叉相互作用常数(CIC),ρ XZ= 0.37,0.34,和0.65 1,2,和3,分别。配体(R 1和R 2)对反应速率的空间效应起作用,但与其他反应相比要小得多次膦酸酯系统。基于CICs的正号,提出了一种具有限速的离去基团从中间体中逐出的逐步机制。主要的正面亲核攻击通过氢键合的,四-中心型过渡状态,提出了原代正常DKIEs和CIC的用于大幅度的基础上2和3,而这两个正面和背面攻击提出相对小的一次正常DKIEs的用于基础上1。
作者:Yingchun Li、Sarah D. Aubert、Eugene G. Maes、Frank M. Raushel
DOI:10.1021/ja048457m
日期:2004.7.1
hydrolysis of phosphinate esters. The wild-type enzyme preferentially hydrolyzes the SP-enantiomers of methyl phenyl p-X-phenylphosphinate esters by 3 orders of magnitude. The mutant enzyme, I106T/F132A/H254G/H257W, exhibits the opposite stereoselectivity and hydrolyzes the RP-enantiomer up to 30 times faster than the corresponding SP-enantiomer. The enantiomerically pure phosphinate esters, prepared from the
Catalysis of the ethanolysis of aryl methyl phenyl phosphinate esters by alkali metal ions: transition state structures for uncatalyzed and metal ion-catalyzed reactions
作者:Ikenna Onyido、Kendall Albright、Erwin Buncel
DOI:10.1039/b501537e
日期:——
substrates, contrary to the generally observed reactivity order in nucleophilicsubstitution processes. The quantities deltaG(ip), deltaG(ts) and DeltaG(cat), which quantify the observed alkali metal ion effect in terms of transition state stabilization through chelation of the metal ion, give the order deltaG(ts) > deltaG(ip) for Li+ and K+. Hammett plots show significantly better correlation of rates with
Organophosphorus derivatives of indazoles and use thereof as medicinal products
申请人:Aventis Pharma S.A.
公开号:US07491710B2
公开(公告)日:2009-02-17
The present invention relates in particular to novel chemical compounds, particularly to novel organophosphorus derivatives of indazoles, to the compositions containing them, and to the use thereof as medicinal products for treating cancers.
Dunn, E. J.; Purdon, J. G.; Bannard, R. A. B., Canadian Journal of Chemistry, 1988, vol. 66, p. 3137 - 3143
作者:Dunn, E. J.、Purdon, J. G.、Bannard, R. A. B.、Albright, K.、Buncel, E.
DOI:——
日期:——
PHOSPHORYLATION OF PHENOLS AND NAPHTHOLS BY PHENYLMETHYLENEPHOSPHINE OXIDE GENERATED BY THE THERMOLYSIS OF A 2-PHOSPHABICYCLO[2.2.2]OCTA-5,7-DIENE 2-OXIDE
A simple method utilising a low-coordinate phosphorus species is described for the phosphorylation of a series of phenols and naphthols to afford aryl methylphenylphosphinates in reasonable yields.