A novel synthetic approach to pyran-2,4-dione scaffold production: Microwave-assisted dimerization, cyclization, and expeditious regioselective conversion into β-enamino-pyran-2,4-diones
作者:Ahmed A.M. Sarhan、Matti Haukka、Assem Barakat、Ahmed T.A. Boraei
DOI:10.1016/j.tetlet.2020.152660
日期:2020.12
using 18 primary amines and four amino acid esters. Microwave-assisted further cyclization of 3-(β-substitutedvinyl)-6-phenyl-pyran-2,4-dione into 3-benzoyl-4,7-diphenyl-2H,5H-pyrano[4,3-b]pyran-2,5-dione via reaction with ethyl benzoyl acetate.
在这里,我们报告一种新颖,绿色,简单,低成本,快速的方法,在微波辐射下高产吡喃2,4-二酮支架。使用18种伯胺和4种氨基酸酯可实现β-二酮体系向β-烯胺酮的区域和立体选择性转化。微波辅助将3-(β-取代乙烯基)-6-苯基-吡喃-2,4-二酮进一步环化为3-苯甲酰基-4,7-二苯基-2 H,5 H-吡喃[4,3- b ]吡喃-2,5-二酮通过与乙酸乙基苯甲酰酯反应。