Ruthenium-Catalyzed Cycloadditions of 1-Haloalkynes with Nitrile Oxides and Organic Azides: Synthesis of 4-Haloisoxazoles and 5-Halotriazoles
作者:James S. Oakdale、Rakesh K. Sit、Valery V. Fokin
DOI:10.1002/chem.201402559
日期:2014.8.25
(Cyclopentadienyl)(cyclooctadiene) ruthenium(II) chloride [CpRuCl(cod)] catalyzes the reaction between nitrileoxides and electronically deficient 1‐choro‐, 1‐bromo‐, and 1‐iodoalkynes leading to 4‐haloisoxazoles. Organicazides are also suitable 1,3‐dipoles, resulting in 5‐halo‐1,2,3‐triazoles. These air‐tolerant reactions can be performed at room temperature with 1.25 equivalents of the respective
(环戊二烯基)(环辛二烯)氯化钌(II)[CpRuCl(cod)] 催化腈氧化物与电子缺陷的 1-氯-、1-溴-和 1-碘炔之间的反应,生成 4-卤代异恶唑。有机叠氮化物也是合适的 1,3-偶极子,产生 5-卤代-1,2,3-三唑。这些耐空气反应可以在室温下进行,相对于炔烃组分,相应的 1,3-偶极子为 1.25 当量。反应性 1-卤代炔烃包括丙炔酰胺、酯、酮和膦酸酯。卤化唑类产物的后官能化可以通过钯催化的交叉偶联反应和活性酰胺基团的操作来实现。用 [Cp*RuCl(cod)](Cp*=五甲基环戊二烯基)观察到的催化缺乏归因于 Cp* 的空间需求(η 5 ‐C 5 Me 5 ) 配体与母体 Cp ( η 5 ‐C 5 H 5 ) 相比。[( η 5 ‐C 5 Me 4 CF 3 )RuCl(cod)]的低反应性支持了这一假设,它作为 Cp* 的等排模拟物和 Cp 的等电子类似物。
Optically active transition-metal complexes VII Iron and ruthenium complexes with the optically active cyclopentadienyl ligand PCp: syntheses and ligand exchange reactions
作者:Bernhard Pfister、Ruedi Stauber、Albrecht Salzer
DOI:10.1016/s0022-328x(96)06849-0
日期:1997.4
The opticallyactivecomplexes [PCpFe(CO)2]2 and [PCpRu(CO)2]2 (PCp = pinene-fused cyclopentadiene) have been converted into half-sandwich complexes PCpM(CO)2X (XCl, Br, I, CH3, COMe, COPh, COMes) by either oxidative or reductive methods. Ligand exchange of one of the diastereotopic carbonyl ligands for a Lewis base L L = tertiary phosphine or phosphite) generates diastereomeric complexes PCpML(CO)X
[EN] HDAC6 INHIBITORS AND IMAGING AGENTS<br/>[FR] INHIBITEURS DE HDAC6 ET AGENTS D'IMAGERIE
申请人:MASSACHUSETTS GEN HOSPITAL
公开号:WO2018191360A1
公开(公告)日:2018-10-18
Provided herein are compounds useful for binding to one or more histone deacetylase enzymes (HDACs). The present application further provides radiolabeled compounds useful as a radiotracer for position emission tomography imaging of HDAC. Methods for prepared unlabeled and labeled compounds, diagnostic methods, and methods of treating diseases associated HDAC are also provided.
Hydrogen-Bond Acceptance of Bifunctional Ligands in an Alkyne−Metal π Complex
作者:Douglas B. Grotjahn、Valentín Miranda-Soto、Elijah J. Kragulj、Daniel A. Lev、Gülin Erdogan、Xi Zeng、Andrew L. Cooksy
DOI:10.1021/ja0774616
日期:2008.1.1
reactive alkyne pi complexes, intermediates in anti-Markovnikovalkynehydration by CpRu bis(phosphine) catalysts with heterocyclic substituents. Each heterocycle accepts a hydrogen bond from an acetylene C-H, as revealed by NMR coupling constants between alkyne 13C and 1H nuclei as well as between alkyne 13C and pyridine 15N (2hJCN). Moreover, further alkyne transformations occur at temperatures from
complex synthesis and catalysis. The utility of this precursor complex is demonstrated in a number of experiments: The counterion of 2 is exchanged by reaction with cinchonidinium Δ-TRISPHAT to give [CpRu(η6-naphthalene)]Δ-TRISPHAT (4; with X-raycrystalstructure). Ligand exchange of 2 in acetonitrile with (Z,Z)-1,5-cyclooctadiene (COD) produces [CpRu(η2:η2-COD)(MeCN)]PF6 (5; with X-raycrystal structure);