An umpolung strategy has been developed for the synthesis of β,γ-unsaturatedketones utilizing nucleophilic β-alkenylation of N-alkoxyenamines, which are prepared in situ fromketones and isoxazolidine, with alkenyl aluminum reagents. Various β,γ-unsaturatedketones have been prepared following this simple procedure under mild conditions.
OLEFINATION OF KETONES USING 1,1-DIMETALLOALKANES DERIVED FROM<i>i</i>-Bu<sub>2</sub>AlCH=CHR - Cl<sub>2</sub>TiCp<sub>2</sub>SYSTEM
作者:Tadao Yoshida
DOI:10.1246/cl.1982.429
日期:1982.4.5
The alkylidenation of ketone carbonyls using 1,1-dimetalloalkanes prepared by the reaction of 1-alkenyldiisobutylalanes with titanocene dichloride afforded the corresponding olefins in good yields.
Synthesis of Linear α,β-Unsaturated Amides from Isocyanates and Alkenylaluminum Reagents
作者:Xiao-Feng Wu、Bo Chen
DOI:10.1055/s-0037-1610753
日期:2020.5
A new approach has been developed for the synthesis of linear α,β-unsaturated amides by the direct coupling of isocyanates with alkenylaluminum reagents. At room temperature, the desired α,β-unsaturated amides were isolated in good to excellent yields with good functional-group tolerance in the absence of any catalyst or additive.
Palladium-catalyzed carbonylative synthesis of α,β-unsaturated amides from aryl azides and alkenylaluminum reagent
作者:Bo Chen、Xiao-Feng Wu
DOI:10.1016/j.jcat.2020.01.017
日期:2020.3
In this work, an interesting procedure for the synthesis of α,β-unsaturatedamides from aryl azides and alkenylaluminum reagent has been developed. With palladium as the catalyst and XPhos as the ligand under carbon monoxide pressure, the desired α,β-unsaturatedamides were isolated in good to excellent yields with good functional group tolerance. Remarkably, this procedure also represents an example
Palladium-Catalyzed Carbonylative Coupling of Aryl Iodides with Alkenylaluminum Reagents
作者:Bo Chen、Xiao-Feng Wu
DOI:10.1021/acs.orglett.9b02923
日期:2019.9.20
A highly reactive catalytic system for the carbonylativecoupling of aryliodides with alkenylaluminum reagents has been developed. Various β-substituted γ,δ-unsaturated ketones were produced under mild conditions in good to excellent yields even under ppm level of palladium catalyst. Notably, this also represents the first example on carbonylative transformation of alkenylaluminum compounds. Additionally