New pyrazine and quinoxaline scaffolds were obtained via an Ugi/Smiles four-component coupling of pyrazinone or quinoxalinone derivatives with isocyanides, aldehydes, and primary amines. (c) 2008 Elsevier Ltd. All rights reserved.
作者:Anaelle Barthelon、Aurélie Dos Santos、Laurent El Kaïm、Laurence Grimaud
DOI:10.1016/j.tetlet.2008.03.100
日期:2008.5
New pyrazine and quinoxaline scaffolds were obtained via an Ugi/Smiles four-component coupling of pyrazinone or quinoxalinone derivatives with isocyanides, aldehydes, and primary amines. (c) 2008 Elsevier Ltd. All rights reserved.
Zeolite Catalysis Enables Efficient Pyrazinone Synthesis in Water
We employed herein a Linde Type A zeolite as a heterogeneous catalyst to condense amino acid amides with glyoxal affording pyrazinones. The synthesis was conducted in water without using corrosive reagents, organic solvents, or additives. The power of this “aquachemistry” was demonstrated through robust, continuous-flow synthesis.