An efficient method for allylation of ketones with tetra-allylstannane
摘要:
A variety of ketones undergo an allylation reaction with tetra-allyltin in the presence of a catalytic amount of Cu(OTf), or Sn(OTf)(2). The method,vas found to be superior to most of the known methods, which are efficient only with aldehydes. (C) 2001 Elsevier Science Ltd. All rights reserved.
Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed, which accommodates a variety of allylic and ketone substrates. Although chiral ligand is necessary for the transformation, no enantioselectivity was observed. Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed
Catalytic Use of Indium(0) for Carbon−Carbon Bond Transformations in Water: General Catalytic Allylations of Ketones with Allylboronates
作者:Uwe Schneider、Masaharu Ueno、Shu̅ Kobayashi
DOI:10.1021/ja804182j
日期:2008.10.22
We have discovered the unprecedented catalytic use of In(0) for catalytic C-C bond transformations. Remarkably, these generalcatalytic allylations of ketones proceeded smoothly in water as a sole solvent under mild conditions, and water proved to be essential for these reactions. Both the displayed substrate scope and the functional group tolerance were excellent. Importantly, the In metal catalyst
我们发现了 In(0) 在催化 CC 键转换中前所未有的催化用途。值得注意的是,这些酮的一般催化烯丙基化反应在温和条件下在作为唯一溶剂的水中顺利进行,并且水被证明是这些反应必不可少的。显示的底物范围和官能团耐受性都非常好。重要的是,In 金属催化剂可以很容易地回收和重复使用,而不会损失催化活性。此外,当使用 α 取代的烯丙基硼酸酯时,观察到不寻常的结构选择性,仅提供正式的 α 加合物。此外,得到的叔均烯丙基醇具有极高的非对映选择性。
Catalytic Use of a Soluble Organoindium(III) Species for Allylation and Crotylation of Ketones with Boronates
The unprecedented use of a solubleorganoindiumspecies, indium(III) hexamethyldisilazide [In(III)(hmds)3], for catalytic carboncarbon bond formations between ketones and boronates, is reported. Various functionalized tertiary homoallyl alcohols were generated easily in high yields. Remarkably, free hydroxy and primary amine functionalities proved to be tolerated. A rate acceleration and markedly
Organomanganese (II) reagents XX: Manganese mediated Barbier and Reformatsky like reactions an efficient route to homoallylic alcohols and β-acetoxyesters
作者:Gérard Cahiez、Pierre-Yves Chavant
DOI:10.1016/s0040-4039(00)70700-3
日期:1989.1
Allylic halides and α-bromoesters react with manganese metal in ethyl acetate; THF can also be used as solvent if a catalytic amount of zinc chloride is added to the reaction mixture. When the reaction is performed in the presence of various aldehydes or ketones, excellent yields of 1,2-addition products are obtained in preparative conditions.