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.
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
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.
Rh2(OAc)4-catalyzed 2,3-migration of β-ferrocenecarboxyl α-diazocarbonyl compounds: an efficient synthesis of ferrocene-containing α,β-unsaturated esters
作者:Shufeng Chen、Yan Du、Haiying Zhao、Baoguo Li
DOI:10.1039/c3ra48071b
日期:——
A series of β-ferrocenecarboxyl α-diazocarbonyl compounds were prepared by the reaction of ferrocenoyl chloride with β-hydroxyl α-diazocarbonyl compounds in the presence of pyridine. The diazo decomposition of these ferrocene-containing diazocarbonyl compounds with Rh2(OAc)4 resulted in 2,3-ferrocenecarboxyl migration to give ferrocene-containing α,β-unsaturated esters in high yields.
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