Synthesis of Hydroxamic Acids by Using the Acid Labile O-2-Methylprenyl Protecting Group
作者:Aigars Jirgensons、Anna Nikitjuka
DOI:10.1055/s-0032-1317687
日期:——
Coupling of carboxylicacids with O-2-methylprenyl hydroxylamine provided O-protected hydroxamic acids, which could be deprotected by treatment with trifluoroacetic acid (TFA) in dichloromethane giving volatile by-products. Protected hydroxamic acids could be N-arylated or alkylated followed by deprotection to give N-substituted hydroxamic acids.
2, 2, 5-Tri-substituted-1, 3, 4-dioxazoles have been prepared by the reactions of benzhydroxamic acids with the diethylketals of such ketones as acetone, cyclohexanone, acetophenone and benzophenone. These dioxazoles decompose at elevated temperatures (above 150°C) into phenylisocyanates and ketones. A kinetic study of the decomposition reaction in nitrobenzene has been attempted, and the first-order rate constants have been obtained.
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
METHOD FOR THE SYNTHESIS OF 3-R-1,4,2-DIOXAZOL-5-ONES TECHNICAL FIELD
申请人:Tesla Motors Canada ULC
公开号:US20200392091A1
公开(公告)日:2020-12-17
Provided are methods of preparing 3-R-1,4,2-dioxazol-5-one compounds using convenient and efficient methods. Also provided are 3-R-1,4,2-dioxazol-5-one compounds produced using the methods described.
New Synthesis of 1,4,2-Dioxazoles and Their Pharmacological Properties
作者:Ned D. Heindel、William P. Fives、Richard A. Carrano
DOI:10.1002/jps.2600660606
日期:1977.6
5-methoxycarbonyl-5-methoxycarbonylmethyl-1,4,2-dioxazoles was prepared by addition of hydroxamic acids to acetylene esters. Eleven of these previously unknown compounds were submitted to general pharmacological screening, and several displayed modest CNS depressant activity.