A Simple Route to NewN(3)-Substituted 5-Aryl-2-(dialkylamino)-1,3-oxazolium Salts andN(1)-Substituted 4-Aryl-2-(dialkylamino)-1H-imidazoles
作者:Torsten Moschny、Horst Hartmann
DOI:10.1002/(sici)1522-2675(19991110)82:11<1981::aid-hlca1981>3.0.co;2-t
日期:1999.11.10
In the reaction of N,N-dialkyl-dichloromethaniminium chlorides 11 with 2-aminoacetophenones 12, a general and simple route to heretofore unknown 5-aryl-substituted 2-(dialkylamino)-1,3-oxazolium salts 13 and 5-aryl-substituted 2-(dialkylamino)oxazoles 14 was found. From the 2-(dialkylamino)-1,3-oxazoles 14, the corresponding oxazolium salts 13 were obtained after alkylation with (MeO)(2)SO2. The new oxazolium salts 13 were converted to 1-substituted 4-aryl-2-(dialkylamino)-1H-imidazoles 9 by treatment with NH4OAc. The possible use of these 1H-imidazoles as dye educts was explored. Analytical data, as well as AMI calculations, reveal some remarkable differences between the structures of the neutral imidazoles 9 and their positively charged oxazolium precursors 13.