catalyzed transformations of O-acyl oximes to various N-heterocycles are well established. Herein, we report a catalyst free, oxime carboxylate based, three-component condensation method to access mono- and disubstituted pyrimidines. A broad range of substituted pyrimidines were prepared in moderate to excellent yields. Control experiments reveal that in situ generated formamidine is the key intermediate.
Deaminative Olefination of Methyl <i>N</i>-Heteroarenes by an Amine Oxidase Inspired Catalyst
作者:Pradip Ramdas Thorve、Biplab Maji
DOI:10.1021/acs.orglett.0c04060
日期:2021.1.15
We explored the bioinspired o-quinone cofactor catalyzed aerobic primary amine dehydrogenation for a cascade olefination reaction with nine different methyl N-heteroarenes, including pyrimidines, pyrazines, pyridines, quinolines, quinoxolines, benzimidazoles, benzoxazoles, benzthiazoles, and triazines. An o-quinone catalyst phd (1,10-phenanthroline-5,6-dione) combined with a Brønsted acid catalyzed
我们探索了仿生邻醌辅因子催化的有氧伯胺脱氢与九种不同的甲基N-杂芳烃的级联烯化反应,包括嘧啶、吡嗪、吡啶、喹啉、喹啉、苯并咪唑、苯并恶唑、苯并噻唑。一个ø与布朗斯台德酸组合的-quinone催化剂博士(1,10-菲咯啉-5,6-二酮)催化的反应。N-杂芳基芪类化合物在温和条件下以高产率和 ( E )-选择性合成,使用氧气 (1 atm) 作为唯一氧化剂,无需过渡金属盐、配体、化学计量碱或氧化剂。
ALPHA-SYNUCLEIN LIGANDS
申请人:Washington University
公开号:US20170189566A1
公开(公告)日:2017-07-06
The present invention generally relates to various compounds that are useful as α-synuclein ligands. The invention further relates to methods of using these compounds and their radiolabeled analogs for the detection of synucleinopathies, including Parkinson's disease (PD).
QUATERNARY AMMONIUM SALT-ASSISTED SYNTHESIS OF EXTENDED π-SYSTEMS FROM METHYLDIAZINES AND AROMATIC ALDEHYDES<sup>1</sup>
作者:Jean Jacques Vanden Eynde、Laurent Pascal、Yves Van Haverbeke、Philippe Dubois
DOI:10.1081/scc-100105893
日期:2001.1
4-Methyl- and 4,6-dimethylpyrimidines, methyl- and 2,5-dimethylpyrazines, as well as 3-methylpyridazine readily react with aromatic aldehydes in a hot solution of sodium hydroxide in the presence of a catalytic amount of a quaternary ammonium salt and in the absence of any organic solvent to yield the corresponding condensation products.
Synthesis and Characterization of Novel <i>para</i>- and <i>meta</i>-Phenylenevinylene Derivatives: Fine Tuning of the Electronic and Optical Properties of Conjugated Materials
作者:L. Pascal、J. J. Vanden Eynde、Y. Van Haverbeke、P. Dubois、A. Michel、U. Rant、E. Zojer、G. Leising、L. O. Van Dorn、N. E. Gruhn、J. Cornil、J. L. Brédas
DOI:10.1021/jp025748d
日期:2002.6.1
We report the synthesis of novel phenylenevinylene derivatives that allow for the introduction of meta versus para connections on the phenylene rings, as well as the incorporation of nitrogen atoms within the conjugated backbone and the attachment of electroactive substituents. We assess the impact of the various derivatization schemes on the electronic and optical properties by means of gas-phase