Synthesis of α-diazo-β-hydroxyesters through a one-pot protocol by phase-transfer catalysis: application to enantioselective aldol-type reaction and diastereoselective synthesis of α-amino-β-hydroxyester derivatives
作者:Kazuya Hasegawa、Shigeru Arai、Atsushi Nishida
DOI:10.1016/j.tet.2005.11.028
日期:2006.2
The one-pot synthesis of α-diazo-β-hydroxyesters from sodium azide under phase-transfer-catalyzed conditions has been achieved. This protocol includes three different chemical transformations promoted by a single catalyst in each step to give products in good to excellent yields. The reaction was applied to a catalytic asymmetric aldol-type reaction using α-diazoesters with aldehydes in the presence
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
One-pot synthesis of α-diazo-β-hydroxyesters under phase-transfer catalysis and application to the catalytic asymmetric aldol reaction
作者:Shigeru Arai、Kazuya Hasegawa、Atsushi Nishida
DOI:10.1016/j.tetlet.2003.11.083
日期:2004.1
The one-pot (three steps) synthesis of α-diazo-β-hydroxyesters from tosyl chloride under phase-transfercatalysis is described. The catalytic asymmetric aldol reaction between a diazoester and aldehydes was also investigated and gave moderate to good enantioselectivity.
Continuous flow synthesis of toxic ethyl diazoacetate for utilization in an integrated microfluidic system
作者:Ram Awatar Maurya、Kyoung-Ik Min、Dong-Pyo Kim
DOI:10.1039/c3gc41226a
日期:——
multiple reactions and separations of hazardous ethyl diazoacetate is presented. The integrated techniques include: a droplet technique for liquid–liquid and/or gas–liquid separation and in situgeneration of the toxic reagent, a dual channel membrane technique based on a cheap polymeric microseparator for liquid–liquid separation, and a capillary microreactor for carrying out cascade reactions in a sequential
A mild, efficient method for the oxidation of α-diazo-β-hydroxyesters to α-diazo-β-ketoesters
作者:Puhui Li、Max M. Majireck、Ilia Korboukh、Steven M. Weinreb
DOI:10.1016/j.tetlet.2008.03.011
日期:2008.5
alpha-diazo-beta-ketoesters can be prepared in good overall yields via a two-step sequence involving addition of ethyl lithiodiazoacetate to aliphatic, aromatic and conjugated aldehydes followed by mildoxidation with the Dess-Martin periodinane.