Halide abstractions from P-chlorinated phosphorus ylides 9a–c either by AlCl3 or SnCl2 yield unsymmetrical methylene phosphoniumions 10a–c in which energy barriers > 83 kJ mol–1 for the rotation around the PC have been estimated by NMR techniques. The salts with AlCl4– counteranions are stable, but compounds with SnCl3– anions decompose stereoselectively to unsymmetrical methylene phosphanes, SnCl2
Benzylphosphonic acid inhibitors of human prostatic acid phosphatase
作者:Charles F. Schwender、Scott A. Beers、Elizabeth A. Malloy、Jacqueline J. Cinicola、David J. Wustrow、Keith D. Demarest、Jerold Jordan
DOI:10.1016/0960-894x(96)00018-2
日期:1996.2
A series of alpha-substituted benzylphosphonic acids is described as inhibitors of human prostatic acid phosphatase, an enzyme which has been used as a model to study aryl phosphatases. The most potent inhibitors in this series are 2-trifluoromethylbenzhydrylphosphonic acid (9 mu M), and alpha-(2-phenylethyl)benzylphosphonic acid (14 mu M) The structure-activity studies suggest that bulk tolerance beyond the phosphate binding area limits the steric or hydrophobic contribution to inhibitor potency achieved through alpha-carbon substitution.
Novel 1-[2-(Diarylmethoxy)ethyl]-2-methyl-5-nitroimidazoles as HIV-1 Non-Nucleoside Reverse Transcriptase Inhibitors. A Structure−Activity Relationship Investigation
作者:Gabriella De Martino、Giuseppe La Regina、Alessandra Di Pasquali、Rino Ragno、Alberto Bergamini、Chiara Ciaprini、Anna Sinistro、Giovanni Maga、Emmanuele Crespan、Marino Artico、Romano Silvestri
DOI:10.1021/jm050273a
日期:2005.6.1
1-[2-(Diarylmethoxy)ethyl]-2-methyl-5-nitroimidazoles (DAMNIs) is a novel family of HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs) active at submicromolar concentration. Replacement of one phenyl ring of 1-[2-(diphenylmethoxy)ethyl]-2-methyl-5-nitroimidazole (4) with heterocyclic rings, such as 2-thienyl or 3-pyridinyl, led to novel DAMNIs with increased activity. In HIV-1 WT cell-based assay the racemic 1-2-alpha-(thiophen-2-yl)phenylmethoxylethyl}-2-methyl-5-nitroimidazole (7) (EC50 = 0.03 mu M) proved 5 times more active than compound 4. Docking experiments showed that the introduction of a chiral center would not affect the binding of both (R)-7 and (S)-7. The internal scoring function of the Autodock program calculated the same inhibition constant (K-i = 7.9 nM) for the two enantiomers. Compounds 7 (ID50 = 8.25 mu M) were found more active than efavirenz (ID50 = 25 mu M) against the viral RT carrying the K103N mutation, suggesting for these compounds a potential use in efavirenz based anti-AIDS regimens.
Mindl,J. et al., Collection of Czechoslovak Chemical Communications, 1972, vol. 37, p. 2568 - 2578