作者:Florencio Zaragoza、Annabelle Gantenbein
DOI:10.1021/acs.oprd.6b00429
日期:2017.3.17
The treatment of ethyl 2-hydroxyimino-4,4,4-trifluoro-3-oxobutanoate (3) with trialkyl phosphites, ethylenediamine, and an excess of a carboxylic acid in pyridine or picoline leads to the formation of an intermediate, which can be aromatized to a pyrazine by treatment with bromine or other oxidants. This synthesis can be performed either with the isolated oxime 3 or from ethyl 4,4,4-trifluoro-3-oxobutanoate
用亚磷酸三烷基酯,乙二胺和吡啶或甲基吡啶中过量的羧酸处理2-羟基亚氨基-4,4,4-三氟-3-氧代丁酸乙酯(3)导致形成中间体,该中间体可以是通过用溴或其他氧化剂处理而芳香化为吡嗪 该合成可以用一锅方式用分离的肟3或由4,4,4-三氟-3-氧代丁酸乙酯(1)进行,而无需改变溶剂,也无需分离任何中间体。