Design, synthesis, and evaluation of postulated transient intermediate and substrate analogues as inhibitors of 4-hydroxyphenylpyruvate dioxygenase
摘要:
An epoxybenzoquinone, 4-hydroxyphenoxypropionic acid, and 2-hydroxy-3-phenyl-3-butenoic acid derivatives have been designed, synthesized, and evaluated for in vitro inhibition activity against 4-hydroxyphenylpyruvate dioxygenase (4-HPPD) from pig liver by the spectrophotometric enol-borate method. The biological data demonstrated that neither epoxybenzoquinone ester nor 2-hydroxy-3-phenyl-3-butenoic acid is an inhibitor of 4-HPPD. The most potent 4-HPPD inhibitor tested was 3-hydroxy-4-phenyl-2(5H)-furanone with an IC50 value of 0.5 muM, which may serve as a lead compound for further design of more potent 4-HPPD inhibitors. (C) 2002 Elsevier Science Ltd. All rights reserved.
Campestarenes: new building blocks with 5-fold symmetry
作者:Seong Nam、David C. Ware、Penelope J. Brothers
DOI:10.1039/c8ob00957k
日期:——
range of derivatives bearing peripheral functional groups suitable for generating supramolecular interactions has been designed and synthesised for potential applications in creating 2D quasicrystal molecular assemblies. The new campestarene derivatives bear ester, carboxylic acid, methoxy, bromo, 4-pyridyl, 4-cyanophenyl and 4-phenyl carboxylic acid groups, including further derivatives of the latter
Campestarene是具有5倍对称性的平面形状持久大环化合物。已设计并合成了一系列带有外围官能团的衍生物,这些衍生物适合于产生超分子相互作用,可用于创建2D准晶体分子组装体的潜在应用。新的樟脑烯衍生物带有酯,羧酸,甲氧基,溴,4-吡啶基,4-氰基苯基和4-苯基羧酸基团,包括后两个在苯基上带有烷基链以改善溶解性的其他衍生物。通过使用Na 2 S 2 O 4对带有硝基和甲酰基的苯酚前体进行还原缩合来制备樟脑烯衍生物。。通过预环化衍生化或通过合成甲氧基取代的樟脑烯和随后的衍生化来安装目标官能团。环化反应可耐受引入的官能团。十个新的樟脑烯衍生物已通过NMR光谱和MALDI-TOF MS进行了表征,尽管某些实例的溶解性差,无法对其进行详细的表征。
Process for the synthesis of phenoxyalkane derivatives
申请人:ICI Australia Limited
公开号:US04837355A1
公开(公告)日:1989-06-06
The invention concerns a process for the synthesis of a compound of formula I ##STR1## wherein: U and V may be chosen from a range of substituents including hydrogen, halogen, alkyl and alkoxy; R.sup.1 and R.sup.2 may be chosen from a range of substituents including hydrogen and alkyl; n is 0, 1 or 2; and W may be chosen from a range of substitutents including the group ##STR2## which may be a free carboxylic acid or derivative thereof; the process comprising reacting a sulfate ester of formula II, wherein Q is a cation, with a compound of formula III, wherein L is a leaving group ##STR3## and hydrolyzing the sulfate ester formed. Preferably the sulfate ester of formula II is prepared by the oxidation of a phenol of formula IV with a persulfate. ##STR4##
Photoacid generators, chemically amplified resist compositions, and patterning process
申请人:——
公开号:US20030215738A1
公开(公告)日:2003-11-20
Photoacid generators are provided by O-arylsulfonyl-oxime compounds having formula (1) wherein R is H, F, Cl, NO
2
, alkyl or alkoxy, n is 0 or 1, m is 1 or 2, r is 0 to 4, r′ is 0 to 5, k is 0 to 4, and G′ and G″ are S or —CH═CH—. Chemically amplified resist compositions comprising the photoacid generators have many advantages including improved resolution, improved focus latitude, minimized line width variation or shape degradation even on long-term PED, and improved pattern profile after development. Because of high resolution, the compositions are suited for microfabrication, especially by deep UV lithography.
1
Branched and sulphonated multi block copolymer and electrolyte membrane using the same
申请人:Shin Chong-kyu
公开号:US20060134494A1
公开(公告)日:2006-06-22
The present invention relates to a branched and sulphonated multi block copolymer and an electrolyte membrane using the same, more precisely, a branched and sulphonated multi block copolymer composed of the repeating unit represented by formula 1 and a preparation method thereof, a hydrogenated branched and sulphonated multi block copolymer, a branched and sulphonated multi block copolymer electrolyte membrane and a fuel cell to which the branched and sulphonated multi block copolymer electrolyte membrane is applied.
The electrolyte membrane of the present invention has high proton conductivity and excellent mechanical properties as well as chemical stability, so it can be effectively used for the production of thin film without the decrease of membrane properties according to the increase of sulfonic acid group since it enables the regulation of the distribution, the location and the number of sulfonic acid group in polymer backbone.