Generation of allyl Grignard reagents via titanocene-catalyzed activation of allyl halides
作者:Lauren M. Fleury、Brandon L. Ashfeld
DOI:10.1016/j.tetlet.2010.02.144
日期:2010.5
A protocol for the generation of allylGrignardreagents via the catalytic activation of allyl halides is described herein. Subsequent nucleophilic addition to carbonyl derivatives provided the desired homo allylic alcohols in excellent yields (84–99%). Evidence suggests that titanocene dichloride catalyzes the formation of an allylGrignard species which reacts solely with the carbonyl electrophile
A Mechanochemical Zinc-Mediated Barbier-Type Allylation Reaction under Ball-Milling Conditions
作者:JieXiang Yin、Roderick T. Stark、Ian A. Fallis、Duncan L. Browne
DOI:10.1021/acs.joc.9b02876
日期:2020.2.21
A ball-milling-enabled zinc-mediatedBarbier-typeallylation reaction is reported. Notably, running the reaction in this manner renders it effective irrespective of the initial morphology of the zinc metal. The process is operationally simple, does not require inert atmospheres or dry solvents, and is reported over a range of aldehyde and ketone substrates; a gram-scale process is demonstrated.
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。
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