The Ullmann Coupling between 2-Chlorobenzoic Acids and Amino Acids; A Valuable Reaction for Preparing 2-Substituted 1-Acetyl-1H-indol-3-yl Acetates
作者:Gilbert Kirsch、Juan Rodriguez Dominguez、Xiao Gang
DOI:10.1055/s-0029-1216851
日期:2009.7
2-Substituted 3-acetoxy-1-acetyl-1H-indoles were prepared by condensing 2-chlorobenzoic acids with amino acids under Ullmann conditions in good yields, and further cyclodecarboxylation using the Rössing method in moderate to good yields.
Bis (2-methyl-2-indolin-3-one) was synthesized from anthranilic acid and β-bromopropionic acid according to Alphen's method and also from indigo by reductive methylation. It was proved that this compound was identical with one of the products obtained from the reduction of ethyl indoxylate with lithium aluminum hydride.