A tandem Aldol-Grob reaction of ketones with aromatic aldehydes
作者:George W. Kabalka、David Tejedor、Nan-Sheng Li、Rama R. Malladi、Sarah Trotman
DOI:10.1016/s0040-4020(98)00976-4
日期:1998.12
Aromatic aldehydes react with ketones to produce(E)-1-aryl-1-alkenes via a tandem Aldol-Grob cleavage reaction sequence. The reaction, initiated by boron trifluoride, also produces a carboxylic acid fragment.
Phosphine-free cobalt pincer complex catalyzed <i>Z</i>-selective semi-hydrogenation of unbiased alkynes
作者:Vinod G. Landge、Jayaraman Pitchaimani、Siba P. Midya、Murugan Subaramanian、Vedichi Madhu、Ekambaram Balaraman
DOI:10.1039/c7cy01994g
日期:——
Herein, we report a novel, molecularly defined NNN-type cobalt pincer complexcatalyzed transfer semi-hydrogenation of unbiased alkynes to Z-selective alkenes. This unified process is highly stereo- and chemo-selective and exhibits a broad scope as well as wide functional group tolerance. Ammonia-borane (AB), a bench-stable substrate with high gravimetric hydrogen capacity, was used as a safe and practical
Ligand-Controlled Cobalt-Catalyzed Transfer Hydrogenation of Alkynes: Stereodivergent Synthesis of <i>Z</i>- and <i>E-</i>Alkenes
作者:Shaomin Fu、Nan-Yu Chen、Xufang Liu、Zhihui Shao、Shu-Ping Luo、Qiang Liu
DOI:10.1021/jacs.6b04271
日期:2016.7.13
Herein, we report a novel cobalt-catalyzed stereodivergent transfer hydrogenation of alkynes to Z- and E-alkenes. Effective selectivity control is achieved based on a rational catalyst design. Moreover, this mild system allows for the transfer hydrogenation of alkynes bearing a wide range of functional groups in good yields using catalyst loadings as low as 0.2 mol %. The general applicability of this
在此,我们报告了一种新型的钴催化的炔烃立体发散转移氢化反应生成 Z-和 E-烯烃。基于合理的催化剂设计实现有效的选择性控制。此外,这种温和的系统允许使用低至 0.2 mol% 的催化剂负载量以良好的产率对带有广泛官能团的炔烃进行转移氢化。该程序的普遍适用性通过合成 50 多种具有良好化学和立体选择性的烯烃而突出。初步机理研究表明,E-烯烃产物是通过连续炔烃氢化得到 Z-烯烃中间体,然后是 Z 到 E 烯烃异构化过程产生的。
Ligand-controlled iridium-catalyzed semihydrogenation of alkynes with ethanol: highly stereoselective synthesis of <i>E</i>- and <i>Z</i>-alkenes
作者:Jinfei Yang、Chengniu Wang、Yufeng Sun、Xuyan Man、Jinxia Li、Fei Sun
DOI:10.1039/c8cc09714c
日期:——
iridium-catalyzed semihydrogenation of alkynes to E- and Z-alkenes with ethanol was developed. Effective selectivity control was achieved by ligand regulation. The use of 1,2-bis(diphenylphosphino)ethane (DPPE) and 1,5-cyclooctadiene (COD) was critical for the stereoselective semihydrogenation of alkynes. The general applicability of this procedure was highlighted by the synthesis of more than 40 alkenes, with
[EN] COBALT COMPLEXES, PROCESS FOR PREPARATION AND USE THEREOF<br/>[FR] COMPLEXES DE COBALT, LEUR PROCÉDÉ DE PRÉPARATION ET LEUR UTILISATION
申请人:COUNCIL SCIENT IND RES
公开号:WO2018225087A1
公开(公告)日:2018-12-13
The present invention discloses a cobalt compound of formula (I), a process for the preparation and use thereof. The present invention further relates to a pharmaceutical composition and a method inhibition of Tau Aggregation in a subject in need thereof using compound of formula (I).