Cross-couplingreactions between α,β-unsaturated carbonyl compounds and aromatic aldehydes have been achieved in tetrahydrofuran (THF) at 25 °C under N2 using a catalytic amount of InCl3 (0.05 molar amount to the substrate) in the presence of both chlorotrimethylsilane (TMSCl) and aluminum foil (Al). These reactions provide the corresponding β,γ-unsaturated ketones in moderate yields, together with
Reactivite du derive lithie issu du dioxolanne du levulate de trimethylsilyle vis-a-vis des derives carbonyles: Une methode directe d'olefination des aldehydes aromatiques et des cetones
作者:Jean-Louis Moreau、René Couffignal
DOI:10.1016/0022-328x(85)80391-0
日期:1985.12
At −60°C and in ether, the organolitium reagent produced by trimethylsilyl 4,4-ethylenedioxypentanoate reacts with aldehydes and ketones, and gives the expected β-hydroxyacids. The β-ethylenic ketones are isolated when the condensation is carried out with aromaticaldehydes and ketones. This proves to be an efficient route for carbonyl olefination.
Metal‐Free Photochemical Olefin Isomerization of Unsaturated Ketones via 1,5‐Hydrogen Atom Transfer
作者:Rajendran Manikandan、Ravindra S. Phatake、N. Gabriel Lemcoff
DOI:10.1002/chem.202200634
日期:2022.5.19
Bring on the Light: An efficient photochemical metal/catalyst-free system has been uncovered for the selective one-bond olefin migration of unsaturated ketones. Diverse substrate scope, functional group tolerance and its application for dehomologation and one-carbon selective olefin migration processes in linear alkenes highlights the usefulness of this method.
The direct chemoselective carbonylative cross-coupling reaction of allylic alcohols and organoalanes with 1 atm CO via nickel catalysis has been developed to access the β,γ-unsaturated ketones with broad scope. The use of organoalanes as both the coupling components and the activators for the alcohol functionalization was found to be both crucial and advantageous as the method does not require any
已经开发了通过镍催化烯丙醇和有机烷烃与 1 atm CO 的直接化学选择性羰基化交叉偶联反应来获得具有广泛范围的 β,γ-不饱和酮。由于该方法不需要任何外部活化剂,因此发现使用有机丙烷作为偶联组分和醇官能化的活化剂既是关键又是有利的。