Activator-free and one-pot C-allylation by simple palladium catalyst in water
摘要:
For atom economic and green chemistry concepts, we develop a reaction that involves one-pot and one step to construct the C-C bond without the help of any activating reagents for allylic alcohols in water. The palladium-catalyzed allylation of cyclic 1,3-diones using allylic alcohols directly gave the corresponding allylated products in 8-99% yields. (C) 2012 Elsevier Ltd. All rights reserved.
An alternative method to Pd-catalyzed Tsuji–Trost reaction is developed and it provides a simpler route for the selective synthesis of a broad range of mono-/bis-allylated and cinnamylated 1,3-dicarbonyl compounds using MMZNiY catalyst at room temperature. Product selectivity can be controlled by the proper choice of catalyst. The catalyst was also well characterized by SEM, TEM, HRTEM, EDAX and X-ray
a variety of ketones, β-keto esters, aldehydes, etc., during enamine–palladium catalysis. Density functional theory calculations reveal that Bz-Gly-OH assists in the formation of an enamine that attacks the π-allylpalladium complex via an outer sphere mechanism. The preliminary result points to an asymmetric allylic alkylation under a new mode of bifunctional catalysis.
Activator-free and one-pot C-allylation by simple palladium catalyst in water
作者:Yi-Jen Shue、Shyh-Chyun Yang
DOI:10.1016/j.tetlet.2012.01.022
日期:2012.3
For atom economic and green chemistry concepts, we develop a reaction that involves one-pot and one step to construct the C-C bond without the help of any activating reagents for allylic alcohols in water. The palladium-catalyzed allylation of cyclic 1,3-diones using allylic alcohols directly gave the corresponding allylated products in 8-99% yields. (C) 2012 Elsevier Ltd. All rights reserved.
Nickel-Catalyzed Asymmetric Allylic Alkylation of β-Dicarbonyl Compounds via C–C Bond Activation of 2-Allylated Cyclic 1,3-Diketones
The asymmetricallylicalkylation (AAA) reaction using less reactive, stable allylic sources is challenging. We achieved a nickel(0)-catalyzed AAA reaction of β-dicarbonyl compounds under ambient conditions through unstrained C–C bond activation of 2-allylated 2-methylcyclohexane-1,3-dione derivatives to afford the corresponding quaternary chiral compounds in high yield with high enantioselectivity