Inhibition of urease results in Helicobacter pylori growth arrest in the stomach, promoting urease as promising targets for gastrointestinal ulcer therapy. Twenty hybrid derivatives of flavonoid scaffold and hydroxamic acid, β-hydroxy-β-phenylpropionylhydroxamic acids, were therefore synthesized and evaluated against H. pylori urease. Biological evaluation of these compounds showed improved urease
Hydroxamic acid and its derivatives as inhibitors of melanocyte tyrosinase for topical skin lighteners
申请人:Integriderm, Inc.
公开号:US20030199558A1
公开(公告)日:2003-10-23
Methods, compounds, and formulations are provided to reduce pigmentation in mammalian skin, comprising hydroxamic acid and its derivatives, and especially benzohydroxamic acid and its derivatives. The compounds preferably inhibit pigment synthesis in melanocytes through inhibition of melanocyte tyrosinase. The methods can be used for lightening skin, and for treating uneven skin complexions, which result from hyperpigmentation-related medical conditions such as melasma, age spots, freckles, ochronosis, and lentigo. The compounds can be used medically or cosmetically, and preferably as topical formulations.
Monohydroxamic acids and bridging dihydroxamic acids as chelators to ruthenium(<scp>iii</scp>) and as nitric oxide donors: syntheses, speciation studies and nitric oxide releasing investigation
作者:Darren Griffith、Krystyna Krot、Jedd Comiskey、Kevin B. Nolan、Celine J. Marmion
DOI:10.1039/b711863e
日期:——
speciation of all of these systems (with the exception of the Ru–1,4-benzodihydroxamic acid and Ru–N-methylbenzohydroxamic systems) in aqueous solution was investigated. We previously proposed that nitrosyl abstraction from hydroxamic acids by RuIII involves initial formation of RuIII-hydroxamates. Yet, until now, no data on the rate of nitric oxide (NO) release from hydroxamic acids has been published. We
的合成和光谱表征新颖的单核钌III(EDTA)(hydroxamato)通式的配合物的[Ru(H 2 EDTA)(单公顷)](其中单公顷= 3-或4- NH 2,2-,3-或4-Cl和3-Me-苯基异羟肟酸酯,以及Ru III - N-芳基芳香异羟肟酸酯的第一个实例,[Ru(H 2 EDTA)(N -Me-bha)]·H 2 O(N报道了-Me-bha =N-甲基苯并氢恶唑。三种双核Ru III与桥连的二氢恶唑烷配合物配体通式[Ru(H 2 EDTA)} 2(μ- di ha)]的化合物,其中di ha = 2,6-吡啶二氢xamato和1,3-或1,4-苯并二氢xamato,它们是第一个与Ru III结合的化合物,也进行了描述。研究了所有这些系统在水溶液中的形态(Ru-1,4-苯并二异羟肟酸和Ru- N-甲基苯并异羟肟酸系统除外)。我们先前曾提出亚硝酰基从异羟肟酸Ru III的制备涉及Ru
Benzhydroximic acids — NMR study of trimethylsilyl derivatives
NMRspectra (1H 13C, 15N, and 29Si) of trimethylsilylated para and meta substitutedbenzhydroxamicacids were studied in chloroform solutions. The silylation products have the structure of Z-O,O′-bis(trimethylsilyl) derivatives of benzhydroximic acid, independently of the ring substituent. According to aromatic proton chemical shifts, the geometry of the hydroximic group and its torsion angle with
Silver-halide photographic light-sensitive material
申请人:Fuji Photo Film Co., Ltd.
公开号:US04439519A1
公开(公告)日:1984-03-27
A silver halide photographic light-sensitive material containing a diffusion resistant coupler, a light-sensitive silver halide and at least one compound represented by the following general formula (I) in the same layer or different layers on a support. ##STR1## wherein R.sup.1 and R.sup.2 independently represent an alkyl group having from 1 to 5 carbon atoms, a hydroxyalkyl group having from 1 to 5 carbon atoms, an alkoxyalkyl group having from 2 to 10 carbon atoms or an alkylsulfonamidoalkyl group having from 2 to 10 carbon atoms; R.sup.3 represents a hydrogen atom, an alkyl group having from 1 to 5 carbon atoms or an alkoxy group having from 1 to 5 carbon atoms; X represents a hydrogen atom or a group capable of being removed with alkali; Y represents ##STR2## and Z represents an alkyl group, an alkenyl group, an aryl group or a heterocyclic group. The compound represented by the general formula (I) is a novel precursor of a color developing agent which provides a sufficiently high color density on development and causes less desensitization as well as less fog or stain formation during storage of any photographic light-sensitive material containing it. A method of forming a color photographic image using the silver photographic light-sensitive material is also disclosed.