DBU-promoted condensation of acyldiazomethanes to aldehydes and imines under catalytic conditions
作者:Nan Jiang、Jianbo Wang
DOI:10.1016/s0040-4039(01)02375-9
日期:2002.2
The condensation of acyldiazomethanes to aldehydes and imines can be promoted with catalytic amount of DBU. The condensation gives β-hydroxy α-diazo carbonyl compounds or β-amino α-diazo carbonyl compounds in high yields.
tert-BuOK-Catalyzed condensation of ethyl diazoacetate to aldehydes and palladium-catalyzed 1,2-hydrogen migration for the synthesis of β-ketoesters under solvent-free conditions
作者:Shufeng Chen、Fang Yuan、Haiying Zhao、Baoguo Li
DOI:10.1039/c3ra41920g
日期:——
A mild and convenient method for the condensation of ethyldiazoacetate (EDA) with aldehydes catalyzed by tert-BuOK under solvent-free conditions was developed. The corresponding α-diazo-β-hydroxy esters were further converted into β-ketoesters through palladium-catalyzed 1,2-hydrogen migration under neat conditions. The two-step transformation exemplifies a simple method for the efficient and green
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.
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.
Stereoselective Intramolecular 1,3 C−H Insertion in Rh(II) Carbene Reactions
作者:Weifeng Shi、Bo Zhang、Jian Zhang、Binge Liu、Shiwei Zhang、Jianbo Wang
DOI:10.1021/ol051130l
日期:2005.7.1
[reaction: see text] 1,3 C-Hinsertion has been found to be a predominant reaction pathway in the Rh(II)-mediated reaction of beta-tosyl alpha-diazo carbonyl compounds.