Catalysis in Water: Aldol-Type Reaction of Aldehydes and Imines with Ethyl Diazoacetate Catalyzed by Highly Basic Magnesium/Lanthanum Mixed Oxide
作者:M. Lakshmi Kantam、V. Balasubrahmanyam、K. B. Shiva Kumar、G. T. Venkanna、F. Figueras
DOI:10.1002/adsc.200600597
日期:2007.8.6
Magnesium/lanthanum mixed oxide is an effective heterogeneous catalyst for aldol-type condensation of aldehydes and imines with ethyl diazoacetate (EDA) at room temperature in water to afford corresponding β-hydroxy-α-diazo carbonyl compounds and β-amino-α-diazo carbonyl compounds in good yields. The catalyst is recovered and reused for several cycles with consistent activity.
A simple and convenient protocol for the synthesis of α-diazo carbonyl compounds from the condensation of ethyldiazoacetate to aldehydes in water was developed using pyrrolidine as a catalyst.
KF/Nano-clinoptilolite Catalyzed Aldol-Type Reaction of Aldehydes with Ethyl Diazoacetate
作者:Javad Balou、Mohammad A. Khalilzadeh、Dariush Zareyee
DOI:10.1007/s10562-017-2158-6
日期:2017.10
nano-clinoptilolite (KF/CP NPs) was used as an excellent catalytic system for direct aldol-type condensation of aldehydes with ethyl diazoacetate under solvent-less conditions. A variety of α-diazo carbonyl derivatives were prepared in good to excellent yields in short reaction times.Graphical Abstract
Catalytic aldol-type reaction of aldehydes with ethyl diazoacetate using quarternary ammonium hydroxide as the base
作者:Ravi Varala、Ramu Enugala、Sreelatha Nuvula、Srinivas R. Adapa
DOI:10.1016/j.tetlet.2005.12.005
日期:2006.2
The direct aldol-type condensation of aldehydes with ethyl diazoacetate (EDA) promoted by an organic base and non-metallic catalyst such as tetrabutylammonium hydroxide (TBAOH) gave β-hydroxy-α-diazocarbonyl compounds with moderate to excellent yields. Furthermore, the reactivity and scope of various phase-transfer catalysts as well as electronically divergent aldehydes are discussed.
Silica-supported tetramethylguanidine catalyst was prepared and effectively used in the aldol-type coupling of aldehydes with ethyl diazoacetate to afford the corresponding α-diazo-β-hydroxy esters in good to excellent yields. The catalyst was quantitatively recovered from the reaction by a simple filtration and reused for a number of cycles with almost consistent activity.