Novel approach to arylhydrazones, the precursor for Fischer indole synthesis, via diazo esters derived from α-amino acid esters
作者:Eiko Yasui、Masao Wada、Norio Takamura
DOI:10.1016/j.tetlet.2005.11.126
日期:2006.1
A novel method for synthesizing arylhydrazones, the precursor for Fischer indole synthesis, using aryllithium reagents and α-diazo esters that are easily obtained from α-aminoacid esters, is described.
Novel method for synthesis of aryl hydrazones from α-diazo esters: scope and limitations of nucleophiles
作者:Eiko Yasui、Masao Wada、Norio Takamura
DOI:10.1016/j.tet.2008.11.028
日期:2009.1
Aryl hydrazones, the precursor of Fischer indole synthesis, were easily obtained by nucleophilic addition of aryllithium reagents to diazo esters. The aryl hydrazones were converted into indoles in good yields by heating with thionyl chloride in alcohol. Grignard reagent was also a good nucleophile, whereas organozinc reagent did not react with diazo esters. Aryllithium reagents were prepared by reacting
N-Heterocyclic Carbene Boryl Iodides Catalyze Insertion Reactions of N-Heterocyclic Carbene Boranes and Diazoesters
作者:Thomas H. Allen、Takuji Kawamoto、Sean Gardner、Steven J. Geib、Dennis P. Curran
DOI:10.1021/acs.orglett.7b01777
日期:2017.7.7
Boron–hydrogen bond insertion reactions of N-heterocycliccarbene (NHC) boranes and diazoesters can be catalyzed by NHC-boryl iodides and produce stable α-NHC-boryl esters. The conditions of the reaction resemble the previous rhodium-catalyzed transformations (only the catalyst is different); however, the mechanisms of the two reactions are probably very different. The new boryl iodide catalyzed method is adept
Hydrazones obtained from alpha-diazo esters were converted to pyrroles when heated with thionyl chloride in alcohol. Among hydrazones, those substituted with a benzene ring on the beta-carbon to the ester are likely to give pyrroles in good yields. (C) 2013 Elsevier Ltd. All rights reserved.