3<i>H</i>-indolium salts efficiently prepared from<i>N</i>-substituted anilines and α-branched ketones by an one-pot synthesis
作者:Thomas Zimmermann、Ortwin Brede
DOI:10.1002/jhet.5570410117
日期:2004.1
and the α-branched ketones 3 the 3H-indolium salts 1 and their fused derivatives 13 are prepared by combining a sodium nitrite nitrosation, a zinc dust reduction, a hydrazoneformation and a Fischerindolization to a reaction sequence in which the isolation and purification of intermediates is not necessary. The scope and limitations of this effective one-potsynthesis are discussed.
A facile synthesis of 3<i>H</i>-indolium perchlorates by one-pot hydrazone formation/fischer indolization
作者:Thomas Zimmermann
DOI:10.1002/jhet.5570370626
日期:2000.11
α-branched ketones 2 and perchloric acid react in boiling ethanol to give via the in situ formed hydrazones 3 1,2,3,3-tetrasubstituted 3H-indoliumperchlorates 4. The scope and limitations of this facilesynthesis of 3H-indolium derivatives which combines the hydrazoneformation and the Fischerindolization to an one-pot procedure are discussed.