β-Ketophosphonates as β-lactamase inhibitors: Intramolecular cooperativity between the hydrophobic subsites of a class D β-lactamase
摘要:
A series of aryl and arylmethyl beta-aryl-beta-ketophosphonates have been prepared as potential beta-lactamase inhibitors. These compounds, as fast, reversible, competitive inhibitors, were most effective ( micromolar K(i) values) against the class D OXA-1 b-lactamase but had less activity against the OXA-10 enzyme. They were also quite effective against the class C b-lactamase of Enterobacter cloacae P99 but less so against the class A TEM-2 enzyme. Reduction of the keto group to form the corresponding beta-hydroxyphosphonates led to reduced inhibitory activity. Molecular modeling, based on the OXA-1 crystal structure, suggested interaction of the aryl groups with the hydrophobic elements of the enzyme's active site and polar interaction of the keto and phosphonate groups with the active site residues Ser 115, Lys 212 and Thr 213 and with the non-conserved Ser 258. Analysis of binding free energies showed that the beta-aryl and phosphonate ester aryl groups interacted cooperatively within the OXA-1 active site. Overall, the results suggest that quite effective inhibitors of class C and some class D beta-lactamases could be designed, based on the beta-ketophosphonate platform. (c) 2008 Published by Elsevier Ltd.
Mn(OAc)<sub>3</sub>-Promoted Oxidative C<sub>sp<sup>3</sup></sub>–P Bond Formation through C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>2</sup></sub> and P–H Bond Cleavage: Access to β-Ketophosphonates
The Mn(OAc)3-promoted oxidative phosphonylation of N,N-dimethylenaminones with H-phosphonates, involving a chemo- and regioselective Csp2–Csp2 bond cleavage and Csp3–P bond formation in one step, provided successfully functionalized β-ketophosphonates under mild reaction conditions. Oxidative Csp3–H/P–H cross-coupling reactions via Csp3–C(C═O) bond cleavage and mechanistic studies are conducted preliminarily
An efficient one-pot synthesis of β-ketophosphonates has been developed, via the reaction of α,β-alkenyl carboxylic acids or alkenes with H-phosphonates and air oxygen, catalyzed by CuSO4·5H2O in CH3CN. CH3CN plays a decisive role, probably by forming an active oxygen complex [(MeCN)nCuII-O-O·].
通过在CH 3 CN中由CuSO 4 ·5H 2 O催化α,β-烯基羧酸或烯烃与H-膦酸酯和空气氧的反应,已经开发出有效的一锅法合成β-酮膦酸酯。CH 3 CN可能起决定性作用,可能是通过形成活性氧络合物[(MeCN)n Cu II -OO·]。
The cascade difunctionalization of α,β-unsaturated carbonyls by nucleophilic halogenation followed by enolate trapping with other electrophiles is highly challenging in synthetic organic chemistry. Herein, we report a chemo- and diastereoselective cascade annulation of enone-tethered cyclohexadienones by using an unconventional combined Lewisacidcatalyzed halogenation reaction in the presence of
Copper-Catalyzed Aerobic Oxidative/Decarboxylative Phosphorylation of Aryl Acrylic Acids with P(III)-Nucleophiles
作者:Biquan Xiong、Lulu Si、Longzhi Zhu、Yu Liu、Weifeng Xu、Ke-Wen Tang、Shuang-Feng Yin、Peng-Cheng Qian、Wai-Yeung Wong
DOI:10.1021/acs.joc.3c01238
日期:2023.9.1
A copper-catalyzed aerobic oxidative/decarboxylative phosphorylation of aryl acrylic acids with P(III)-nucleophiles via the Michaelis–Arbuzov rearrangement for the synthesis of β-ketophosphine oxides, β-ketophosphinates, and β-ketophosphonates is reported. The present reaction could be conducted effectively without the use of a ligand and a base. Various kinds of aryl acrylic acids and P(III)-nucleophiles