Silicon-Based Cross-Coupling Reagent and Production Method of Organic Compound Using the Same
申请人:Nakao Yoshiaki
公开号:US20090069577A1
公开(公告)日:2009-03-12
In one embodiment of the present invention, a silicon-based cross-coupling reagent is disclosed which is a highly stable tetraorganosilicon compound allowing for a cross-coupling reaction under mild reaction conditions without using fluoride ions, transition metal promoter, or strong bases, and the residue of the silicon reagent can be recovered and reused. The silicon-based cross-coupling reagent is a silicon compound in which an o-hydroxymethylphenyl group is connected to a silicon atom for intramolecular activation.
diverse range of functional groups including silyl protections. The silicon residue is readily recovered and reused on a gram-scale synthesis. Intramolecular coordination of a proximal hydroxyl group is considered to efficiently form pentacoordinate silicates having a transferablegroup possibly at an axial position and, thus, responsible for the cross-coupling reaction under conditions significantly
通过使用保护的[2-(羟甲基)苯基]二甲基硅烷,通过铂或钌催化剂催化的炔烃的立体和区域选择性氢化硅烷化反应,制备高度稳定的烯基[2-(羟甲基)苯基]二甲基硅烷。通过与烯基格氏试剂的开环反应,环状甲硅烷基醚1,1-二甲基-2-氧杂-1-silaindan也用作烯基硅烷的原料。在使用K 2 CO 3的反应条件下,所得烯基硅烷与各种芳基和烯基碘化物进行交叉偶联反应以高度区域性和立体定向方式在35–50°C下作为碱。该反应可耐受各种官能团,包括甲硅烷基保护基。硅残留物很容易被回收并以克级合成法再利用。近端羟基的分子内配位被认为有效地形成了可能在轴向位置具有可转移基团的五配位硅酸盐,因此,在比基于硅的反应所报道的条件温和得多的条件下,负责交叉偶联反应。
Palladium-Tetraphosphine Catalysed Heck Reaction with Simple Alkenes: Influence of Reaction Conditions on the Migration of the Double Bond
The Heck reaction of aryl halides with simple alk-1-enes is a powerful method for the synthesis of ( E)-1-arylalk-1-ene derivatives. The major problem of this reaction is the palladium-catalysed migration of the carbon-carbon double bond along the alkyl chain. We observed that this migration could be partially controlled using appropriate reaction conditions. The ramification of the alkyl chain and
Olefination of<i>N</i>-Sulfinylimines under Mild Conditions
作者:Shubhendu Dhara、Charles E. Diesendruck
DOI:10.1002/ejoc.201601577
日期:2017.2.24
A very simple and efficient diastereoselective synthesis of 1,2-disubstituted alkenes has been achieved under mildconditions. The sulfoxide stabilised N-sulfinylimine reacted with in situ generated phosphonate carbanion to give 1, 2-disubtituted alkenes in good to excellent yields. Different aryl phosphonate reacted with a range of electronically diverse N-sulfinylimine to afford in almost greater
Compounds that have agonist activity at one or more of the S1P receptors are provided. The compounds are sphingosine analogs that, after phosphorylation, can behave as agonists at S1P receptors.