作者:Yan Xu、Jonathan J. Wong、Adrian E. Samkian、Jeong Hoon Ko、Shuming Chen、K. N. Houk、Robert H. Grubbs
DOI:10.1021/jacs.0c11334
日期:2020.12.16
cyclometalated ruthenium catalysts with bulky N-heterocycliccarbene (NHC) ligands. Superior reactivity and stereoselectivity are realized for the first time in this challenging transformation, allowing streamlined access to an important class of cis-Michael acceptors from readily available feedstocks. The kinetic preference for cross-metathesis is enabled by a pivalate anionic ligand, and the origin
通过使用具有庞大 N-杂环卡宾 (NHC) 配体的新型环金属化钌催化剂,开发了丙烯酰胺和普通末端烯烃之间的高效 Z 选择性交叉复分解。在这一具有挑战性的转化中首次实现了卓越的反应性和立体选择性,允许从现成的原料中简化获得一类重要的顺式迈克尔受体。交叉复分解的动力学偏好是由新戊酸盐阴离子配体实现的,这种效应的起源通过密度泛函理论计算得到阐明。
[EN] SECOND GENERATION GRP94-SELECTIVE INHIBITORS<br/>[FR] INHIBITEURS SÉLECTIFS DE GRP94 DE SECONDE GÉNÉRATION
申请人:UNIV KANSAS
公开号:WO2019040792A1
公开(公告)日:2019-02-28
The present technology provides compounds selective for the Grp94 isoform, as well as compositions including such compounds, that are useful for treatment of multiple myeloma, melanoma, lung cancer, hepatocellular carcinoma, breast cancer, prostate cancer, and/or glaucoma. Methods using the compounds are also provided.
Fast Olefin Metathesis: Synthesis of 2-Aryloxy-Substituted Hoveyda-Type Complexes and Application in Ring-Closing Metathesis
作者:Pavlo Kos、Roman Savka、Herbert Plenio
DOI:10.1002/adsc.201200956
日期:2013.1.16
donation of the diaryl ether oxygen atoms in complexes 5 and 6 led to rapidly initiating precatalysts. The Ru(II/III) redox potentials of complexes 6 were determined (6a–d: ΔE=0.89–1.08 V). In the crystal structure of 5b two independent molecules were observed in the unit cell, displaying RuO distances of 226.6(4) and 230.5(3) pm. The catalytic performance of complexes 5 and 6 in various ring-closing metathesis
[EN] RUTHENIUM-BASED METATHESIS CATALYSTS, PRECURSORS FOR THEIR PREPARATION AND THEIR USE<br/>[FR] CATALYSEURS DE MÉTATHÈSE À BASE DE RUTHÉNIUM, PRÉCURSEURS POUR LEUR PRÉPARATION ET LEUR UTILISATION
申请人:UMICORE AG & CO KG
公开号:WO2014067767A1
公开(公告)日:2014-05-08
The invention is directed to ruthenium-based metathesis catalysts of the Grubbs-Hoveyda type. The new 2-aryloxy-substituted ruthenium catalysts described herein reveal rapid initiation behavior. Further, the corresponding styrene-based precursor compounds are disclosed. The catalysts are prepared in a cross-metathesis reaction starting from styrene-based precursors which can be prepared in a cost- effective manner. The new Grubbs-Hoveyda type catalysts are suitable to catalyze ring- closing metathesis (RCM), cross metathesis (CM) and ring- opening metathesis polymerization (ROMP). Low catalyst loadings are necessary to convert a wide range of substrates including more complex and critical substrates via metathesis reactions at low to moderate temperatures in high yields within short reaction times.
and dibenzothiepine/dibenzoxepine from readily available starting materials. The Mizoroki―Heck cyclization as the final step was optimized to afford full conversion of the corresponding diaryl (thio)ethers and furthermore to achieve reasonably good selectivity between the 6-exo and the 7-endo products.