Development of the Enantioselective Addition of Ethyl Diazoacetate to Aldehydes: Asymmetric Synthesis of 1,2-Diols
作者:Barry M. Trost、Sushant Malhotra、Philipp Koschker、Pascal Ellerbrock
DOI:10.1021/ja206995s
日期:2012.2.1
A novel synthetic strategy toward the asymmetric synthesis of vicinal diols bearing a tertiary center is presented. The method encompasses the dinuclear Mg-catalyzed asymmetric addition of ethyldiazoacetate into several aldehydes, oxidation of the diazo functionality, and diastereoselective alkyl transfer of various organometallics into the resulting chiral β-hydroxy-α-ketoesters to afford a diverse
Abstract The aldoladdition of acyldiazomethane with aromatic aldehydes, vinyl aldehyde and aliphatic aldehydes was carried out efficiently in the presence of MgI2 etherate and iPr2EtN (DIPEA) using untreated reagent-grade CH2Cl2 under atmospheric conditions in good to excellent yields. Iodide counterion and a non-coordinating reaction media (i.e. CH2Cl2) are among the critical factors for the unique
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