几个2,3,3-cycloalkeno-5,6-cycloalkeno-4 H -pyran-4-ones,例如2,3,5,6-bicyclopenteno-4 H -pyran -4-one和1,2-dihydronaphtho [3 ,4- b ]环戊烯并[1,2- ë ] -4- ħ吡喃-4-酮中,通过环状酮烯胺和diacylchloride的反应方便地合成。该反应为制备这些化合物提供了一种新方法,该方法可能是合成某些有用杂环的前体。
One-Pot Synthesis of Multi-Substituted 4-Pyrones by a Gold- Catalyzed Cascade of Wolff Rearrangement/[4+2] Cycloaddition/ Elimination Reactions
作者:Pratik Neupane、Likai Xia、Yong Rok Lee
DOI:10.1002/adsc.201301086
日期:2014.8.11
AbstractAn efficient one‐pot method is described for the synthesis of a variety of di‐ and trisubstituted 4‐pyrones based on the gold‐catalyzed cascade reactions between cyclic or acyclic diazodicarbonyl compounds and vinyl ethers. The key strategy used involves the gold‐catalyzed Wolff rearrangement of diazo compounds followed by [4+2] cycloaddition and elimination. This methodology is also applied to the synthesis of tetrasubstituted 4‐pyrones.magnified image