Ugi Reactions with Ammonia Offer Rapid Access to a Wide Range of 5-Aminothiazole and Oxazole Derivatives
摘要:
A series of Ugi reactions has been successfully performed using ammonia as the amine component, employing 2,2,2-trifluoroethanol its a non-nucleophilic solvent in order to suppress known side reactions. Utilizing concentrated aqueous ammonia its it convenient Source, this approach offered a simple, one-step assembly of Ugi adducts suitable for elaboration into it variety of 5-aminoazole compounds through postcondensation modifications. Free or N-substituted 5-aminothiazoles and 5-(trifluoroacetamido)oxazoles were all prepared by this improved methodology. The scope of the synthetic route developed and application of the different products are discussed.
Ugi Reactions with Ammonia Offer Rapid Access to a Wide Range of 5-Aminothiazole and Oxazole Derivatives
作者:Mark J. Thompson、Beining Chen
DOI:10.1021/jo9014529
日期:2009.9.18
A series of Ugi reactions has been successfully performed using ammonia as the amine component, employing 2,2,2-trifluoroethanol its a non-nucleophilic solvent in order to suppress known side reactions. Utilizing concentrated aqueous ammonia its it convenient Source, this approach offered a simple, one-step assembly of Ugi adducts suitable for elaboration into it variety of 5-aminoazole compounds through postcondensation modifications. Free or N-substituted 5-aminothiazoles and 5-(trifluoroacetamido)oxazoles were all prepared by this improved methodology. The scope of the synthetic route developed and application of the different products are discussed.