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.
Deep eutectic solvent (DES) was employed as dual solvent/catalyst in the green synthesis of α-diazocarbonyl compounds using aldol-type coupling. α-Diazocarbonyl compounds are important syntheticintermediates with useful application for synthesis of amino alcohols and acids and many natural products. Moreover, the method is environmentally friendly because of avoidance of toxic solvents or hazardous