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