DMF Dimethyl Acetal as Carbon Source for α-Methylation of Ketones: A Hydrogenation–Hydrogenolysis Strategy of Enaminones
摘要:
A novel heterogeneous catalytic hydrogenation hydrogenolysis strategy has been developed for the alpha-methylation of ketones via enaminones using DMF dimethyl acetal as carbon source. This strategy provides a very convenient route to alpha-methylated ketones using a variety of ketones without any base or oxidant.
DMF Dimethyl Acetal as Carbon Source for α-Methylation of Ketones: A Hydrogenation–Hydrogenolysis Strategy of Enaminones
摘要:
A novel heterogeneous catalytic hydrogenation hydrogenolysis strategy has been developed for the alpha-methylation of ketones via enaminones using DMF dimethyl acetal as carbon source. This strategy provides a very convenient route to alpha-methylated ketones using a variety of ketones without any base or oxidant.
describe a practical and efficient one‐pot multicomponent reaction for the synthesis of α‐ketotriazoles from readily available buildingblocks such as methyl ketones, N,N‐dimethylformamide dimethyl acetal, and organic azides with 100 % regioselectivity. This reaction is enabled by the in situ formation of an enaminone intermediate followed by its 1,3‐dipolar cycloaddition reaction with an organic azide
Scissoring Enaminone C═C Double Bond by Free Radical Process for the Synthesis of α-Trifluoromethyl Ketones with CF<sub>3</sub>SO<sub>2</sub>Na
作者:Lu Gan、Qing Yu、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.0c02431
日期:2021.1.1
The C═C double bond cleavage on tertiary enaminones, enabling the formation of a new C–CF3 bond, has been realized as a practical method for the synthesis of α-trifluoromethyl ketones with only the promotion of TBHP and ambient heating. Control experiments support that the reactions proceed via a featured freeradical process. The deuterium labeling experiment employing D2O indicates that water participated
Highly Fluorinated (σ-Aryl)-Chelating Titanium(IV) Post-Metallocene: Characterization and Scalar [C–H···F–C] Coupling
作者:Cham-Chuen Liu、Loi-Chi So、Jerry C. Y. Lo、Michael C. W. Chan、Hiromu Kaneyoshi、Haruyuki Makio
DOI:10.1021/om3002334
日期:2012.8.13
bis(benzyl) complex in solution was probed using multinuclear NMR spectroscopic experiments (including [1H,19F]-HMQC and -HMBC), which reveal scalarcouplingacross C–H···F–C interactions between methylene hydrogens and the proximal CF3 group on the σ-aryl (but not the phenolate) moiety. High activities are observed for ethylene polymerization at different temperatures, which exceed those for the tBu-phenolate
Thiazole-5-carbaldehyde Synthesis by Cascade Annulation of Enaminones and KSCN with Dess–Martin Periodinane Reagent
作者:Kang Chen、Baoli Zhao、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.2c01881
日期:2022.11.4
reagent-mediated reactions of tertiary enaminones with potassium thiocyanate for the synthesis of thiazole-5-carbaldehydes are developed. The product formation involves cascade hydroxyl thiocyanation of the C═C double bond, intramolecular hydroamination of the C≡N bond, and thiazole annulation by condensation on the ketone carbonyl site, representing novelreaction pathways in the reactions between enaminones
Tunable Key [3 + 2] and [2 + 1] Cycloaddition of Enaminones and α-Diazo Compounds for the Synthesis of Isomeric Isoxazoles: Metal-Controlled Selectivity
作者:Wenli Song、Yunyun Liu、Nan Yan、Jie-Ping Wan
DOI:10.1021/acs.orglett.3c00636
日期:2023.3.31
esters/ketones, and t-butyl nitrite (TBN) for the switchable synthesis of isomeric isoxazoles have been realized. The catalysis with Cu(II) salt provides 3,4-disubsituted isoxazoles via [3 + 2] cycloaddition. On the other hand, the catalysis of Ag(I) with identical substrates leads to isomeric isoxazoles with reversed C3 and C4 substitution based on a key [2 + 1] cycloaddition.