在富电子芳族化合物与儿茶酚硼烷的亲电CHH硼化反应中,亲电硼的催化生成是由各种Lewis和Brønsted酸对BH键的杂化作用引发的,它仅形成硼离子。配体解离后,相应的硼离子在苯胺衍生物以及含氮杂环上进行区域选择性亲电芳香取代。使用B(C 6 F 5)3来优化催化作用作为引发剂,并且在不添加外部碱或二氢受体的情况下进行。为了确保这些Friedel-Crafts型反应的有效转换,通常需要高于80°C的温度。机理实验表明,释放氢的硼/硼离子的再生是决定速率的。这一发现最终导致人们发现,添加烯烃后,催化CHH硼化可以首次在室温下进行。
Heterocyclic derivatives as modulators of ion channels
申请人:Martinborough Esther
公开号:US20080027067A1
公开(公告)日:2008-01-31
The present invention relates to heterocyclic derivatives useful as inhibitors of ion channels. The invention also provides pharmaceutically acceptable compositions comprising the compounds of the invention and methods of using the compositions in the treatment of various disorders.
SECOND-ORDER NONLINEAR OPTICAL COMPOUND AND NONLINEAR OPTICAL ELEMENT COMPRISING THE SAME
申请人:Otomo Akira
公开号:US20120172599A1
公开(公告)日:2012-07-05
Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore.
Solution: a chromophore comprising a donor structure D, a π-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
Benzylic C–H addition of aromatic amines to alkenes using a scandium catalyst
作者:Jianhong Su、Yuncong Luo、Xin Xu
DOI:10.1039/d1cc00306b
日期:——
An efficient and selective benzylic C(sp3)–H addition of o-CH3-substituted tertiary aromatic amines to alkenes has been achieved using an anilido-oxazoline ligand supported scandium catalyst, which provides an atom-economic method for the synthesis of a new family of alkylated tertiary anilines. A wide range of amine and alkene substrates are compatible with the catalyst system.
Reductive <i>N</i>-methylation of quinolines with paraformaldehyde and H<sub>2</sub> for sustainable synthesis of <i>N</i>-methyl tetrahydroquinolines
作者:Hongli Wang、Yongji Huang、Qi Jiang、Xingchao Dai、Feng Shi
DOI:10.1039/c8cc10309g
日期:——
One-pot reductive N-methylation of quinolines with paraformaldehyde and H2 over Pd/C catalyst was developed for the synthesis of N-methyl-1,2,3,4-tetrahydroquinolines.
Friedel-Crafts-Type Intermolecular C−H Silylation of Electron-Rich Arenes Initiated by Base-Metal Salts
作者:Qin Yin、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1002/anie.201510469
日期:2016.2.24
An electrophilic aromatic substitution (SEAr) with a catalytically generated silicon electrophile is reported. Essentially any commercially available base‐metal salt acts as an initiator/catalyst when activated with NaBArF4 . The thus‐generated Lewis acid then promotes the SEAr of electron‐rich arenes with hydrosilanes but not halosilanes. This new C−H silylation was optimized for FeCl2 /NaBArF4 ,
亲电芳族取代(S Ë报道AR)与催化产生的硅电试剂。当用NaBAr F 4活化时,基本上任何市售的贱金属盐都可作为引发剂/催化剂 。然后,由此产生的路易斯酸会与氢硅烷(而不是卤代硅烷)一起促进富电子芳烃的S E Ar。针对FeCl 2 / NaBAr F 4对这种新的CHH甲硅烷基化进行了优化, 在低至0.5 mol%的催化剂负载下提供了良好的收率。该过程非常简单,与典型的Friedel-Crafts方法非常接近,在该方法中不需要添加碱来吸收释放的质子。