Microwave-assisted synthesis of fused pyrazolo[3,4-b]pyrazines by the reaction of ortho-aminonitrosopyrazoles and cyclic β-diketones
作者:Jairo Quiroga、Norha E. Sánchez、Paola Acosta、Braulio Insuasty、Rodrigo Abonia
DOI:10.1016/j.tetlet.2012.04.083
日期:2012.6
Novel fused pyrazolo[3,4-b]pyrazines 3 were prepared by assisted microwave cyclocondensation reaction of ortho-aminonitrosopyrazoles 1 and cyclic β-diketones 2 in dimethylformamide. This protocol provides a simple procedure for the synthesis of the title compounds with the advantages of easy work-up, mild reaction conditions and good yields.
新型的稠合吡唑并[3,4- b ]吡嗪3是通过在二甲基甲酰胺中进行的邻氨基亚硝基吡唑1和环状β-二酮2的微波环缩合反应制备的。该方案为标题化合物的合成提供了一种简单的方法,具有易于后处理,温和的反应条件和良好的收率的优点。