A PS-DES immobilized ruthenium carbene: a robust and easily recyclable catalyst for olefin metathesis
摘要:
The butyldietliylsilyl polystyrene (PS-DES) supported ruthenium carbene 7 is a robust, practical and easily recyclable catalyst for olefin metathesis of substituted olefins. (C) 2002 Published by Elsevier Science Ltd.
Lewis acid-promoted addition of allyl(cyclopentadienyl)iron(II) dicarbonyl to unactivated ketones
摘要:
The Lewis acid-promoted addition of allyl(cyclopentadienyl)iron(II) dicarbonyl (1) to unactivated ketones provides zwitterionic iron-olefin complexes 5 as isolable salts. Treatment of these complexes with NaI in wet acetone affords homoallylic alcohols in good to excellent overall yields.
Rapid and Solvent-Free Synthesis of Homoallyl or Homopropargyl Alcohols Mediated by Zinc Powder
作者:Jin-xian Wang、Xuefeng Jia、Tuanjie Meng、Li Xin
DOI:10.1055/s-2005-872178
日期:——
A rapid and efficient procedure for the solvent-free synthesis of homoallylic and homopropargyl alcohols has been achieved by zinc-mediated Barbier-type reaction of carbonyl compounds at room temperature.
室温下,锌介导的Barbier型反应实现了醛酮化合物无溶剂合成同烯丙醇和同炔丙醇的高效快速方法。
A General Catalytic Allylation Using Allyltrimethoxysilane
mild catalytic allylation of carbonyl compounds, applicable to aldehydes, ketones, and imines is developed using allyltrimethoxysilane as the allylating reagent. The reaction proceeds smoothly with 1-10 mol % of CuCl and TBAT in THF at ambient temperature. Mechanism studies indicated that the copper alkoxide, allylfluorodimethoxysilane, and allyltrimethoxysilane are essential to promote the reaction
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
Allylation of Carbonyl Compounds by Allylic Acetates Using a Cobalt Halide as Catalyst
作者:Corinne Gosmini、Paulo Gomes、Jacques Périchon
DOI:10.1055/s-2003-40999
日期:——
In acetonitrile as solvent and in the presence of a simple cobalt halide as catalyst, the reduction by zinc dust of a mixture of aldehydes or ketones and allylic acetates affords the corresponding homoallylic alcohols in good yields.