A Facile and Efficient Synthesis of 3,5-Disubstituted Tetronic Acids in Aqueous Media Involving Acid-Catalyzed Intramolecular Oxa-Pyridylethylation
作者:Qun Liu、Dewen Dong、Xihe Bi、Shaoguang Sun、Jun Liu、Wei Pan、Lei Zhao
DOI:10.1055/s-2004-836034
日期:——
A facile and efficient one-pot synthesis of 3-[bis(alkylthio/alkylamino)methylene]-5-(pyridyl/quinoylmethyl) furan-2,4(3H,5H)-diones 3 and 10, based on a sequential aldol condensation and lactonization reaction between α-oxo ketene-S,S-acetals 1 and pyridine/qinoline-carboxaldehydes 2 in aqueous media, has been developed. A mechanism involving an acid-catalyzed intramolecular oxa-pyridylethylation
基于顺序羟醛缩合的 3-[双(烷硫基/烷氨基)亚甲基]-5-(吡啶基/喹酰基甲基)呋喃-2,4(3H,5H)-二酮 3 和 10 的简便高效的一锅法合成α-氧代乙烯酮-S,S-缩醛 1 和吡啶/喹啉-甲醛 2 在水性介质中的内酯化反应。提出了一种涉及酸催化的分子内氧杂-吡啶乙基化反应的机制来形成内酯环。