描述了使用分子氧作为氧化剂的高效Cs 2 CO 3催化的硫醇与膦酸酯和芳烃的氧化偶联。这些反应不仅提供了一种新颖的碱金属盐催化的好氧氧化反应,而且提供了一种在制药和农药中普遍发现的硫代磷酸盐和亚硫基芳烃的有效方法。该反应在简单温和的反应条件下进行,可耐受各种官能团,适用于生物活性分子的后期合成和修饰。
Solid phase synthesis of peptides containing a phosphoserine - sulfur mustard adduct
摘要:
Solid phase synthesis of peptides containing a serine thiodiglycol phosphate residue has been achieved by following a global on-resin phosphorylation strategy with a functionalized benzyl phosphoramidite. To preclude cleavage of the acid labile thiodiglycol phosphate ester during deprotection, the thioether functionality was temporarily protected as a sulfoxide. Copyright (C) 1996 Elsevier Science Ltd.
Microwave-Assisted Preparation of Fused Bicyclic Heteroaryl Boronates: Application in One-Pot Suzuki Couplings
作者:Erin F. DiMauro、Jason R. Vitullo
DOI:10.1021/jo060218p
日期:2006.5.1
The rapid and efficient synthesis of various disubstituted 5,6-fused heterocycles using a microwave-assisted one-pot cyclization−Suzuki coupling approach is described. This work highlights the tolerance of the boronic ester functional group to a variety of reaction conditions and the utility of functionalized boronates as penultimate intermediates in the synthesis of diverse compound libraries.
The effects of substrate orientation on the mechanism of a phosphotriesterase
作者:Colin J. Jackson、Jian-Wei Liu、Michelle L. Coote、David L. Ollis
DOI:10.1039/b512399b
日期:——
While the underlying chemistry of enzyme-catalyzed reactions may be almost identical, the actual turnover rates of different substrates can vary significantly. This is seen in the turnover rates for the catalyzed hydrolysis of organophosphates by the bacterial phosphotriesterase OpdA. We investigate the variation in turnover rates by examining the hydrolysis of three classes of substrates: phosphotriesters, phosphothionates, and phosphorothiolates. Theoretical calculations were used to analyze the reactivity of these substrates and the energy barriers to their hydrolysis. This information was then compared to information derived from enzyme kinetics and crystallographic studies, providing new insights into the mechanism of this enzyme. We demonstrate that the enzyme catalyzes the hydrolysis of organophosphates through steric constraint of the reactants, and that the equilibrium between productively and unproductively bound substrates makes a significant contribution to the turnover rate of highly reactive substrates. These results highlight the importance of correct orientation of reactants within the active sites of enzymes to enable efficient catalysis.
Neuroprotective agents and methods related thereto
申请人:Nippon Kayaku Co., Ltd.
公开号:US06399606B1
公开(公告)日:2002-06-04
Neuroprotective agents are disclosed having the following structure:
wherein R1, R2, R3, R4 and R5 are as defined herein. Such compounds have utility in the treatment of conditions which benefit from administration of neuroprotective agents generally, including treatment of central and peripheral nervous condition as well as for promoting nerve cell differentiation. Methods of treating such conditions are also disclosed, as are pharmaceutical compositions containing one or more of the compounds of this invention.
Sulfonylethyl and thioethyl phosphorodiamidates, their preparation and intermediates in their preparation, formulations containing them, and their pharmaceutical use. The compounds are useful for treating cancer, alone and in combination with other anticancer therapies.
Discovery of <i>N</i>-Phenylaminomethylthioacetylpyrimidine-2,4-diones as Protoporphyrinogen IX Oxidase Inhibitors through a Reaction Intermediate Derivation Approach
作者:Da-Wei Wang、Lu Liang、Zhi-Yuan Xue、Shu-Yi Yu、Rui-Bo Zhang、Xia Wang、Han Xu、Xin Wen、Zhen Xi
DOI:10.1021/acs.jafc.1c00796
日期:2021.4.14
(NtPPO) inhibitory and herbicidal activity evaluations led to identifying some compounds with improved NtPPO inhibition potency than saflufenacil and good post-emergence herbicidal activity at 37.5–150 g of ai/ha. Among these analogues, ethyl 2-((((2-chloro-4-fluoro-5-(3-methyl-2,6-dioxo-4-(trifluoromethyl)-3,6-dihydropyrimidin-1(2H)-yl)phenyl)amino)methyl)thio)acetate (2c) (Ki = 11 nM), exhibited excellent
原卟啉原氧化酶(PPO,EC 1.3.3.4)是发现绿色除草剂的有效靶点。在这项工作中,我们在研究我们最初设计的N-苯基尿嘧啶噻唑烷酮 ( 1 ) 的反应中间体的基础上,意外发现了一系列新的N-苯基氨基甲硫基乙酰基嘧啶-2,4-二酮 ( 2-6 ) 作为有前景的 PPO 抑制剂。开发了一种高效的一锅法程序,可以以良好到高的收率产生 41 种目标化合物。系统性烟草PPO (NtPPO) 抑制和除草活性评估导致鉴定出一些化合物,其 NtPPO 抑制效力优于苯嘧磺草胺,并且在 37.5-150 g ai/ha 下具有良好的芽后除草活性。在这些类似物中,乙基 2-((((2-氯-4-氟-5-(3-甲基-2,6-二氧代-4-(三氟甲基)-3,6-二氢嘧啶-1(2 H )-基)苯基)氨基)甲基)硫代)乙酸酯 ( 2c ) ( K i = 11 nM),在 37.5–150 g ai/ha 时表现出优异的杂草控制效果,并且在