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.
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
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
Allyliodide reacts in situ with cerium amalgam to generate allyl cerium iodide, which in turn reacts with ketones to yield homoallylic alcohols in good yields.
Rhodium-Catalyzed Kinetic Resolution of Tertiary Homoallyl Alcohols via Stereoselective Carbon−Carbon Bond Cleavage
作者:Ryo Shintani、Keishi Takatsu、Tamio Hayashi
DOI:10.1021/ol800120p
日期:2008.3.1
A nonenzymatic kinetic resolution of tertiary homoallyl alcohols has been developed through a rhodium-catalyzed retro-allylation reaction under simple conditions. Selectivity factors of up to 12 have been achieved by employing (R)-H8-binap as the ligand, and the reaction can be conducted on a preparative scale.