BF<sub>3</sub>·OEt<sub>2</sub>-Mediated C-C Bond-Forming Reaction of α-Hydroxyketene-(<i>S</i>,<i>S</i>)-acetals with Active Methylene Compounds and Its Application in the Synthesis of Substituted 3,4-Dihydro-2-pyridones
作者:Fushun Liang、Qun Liu、Jun Liu、Bing Li
DOI:10.1055/s-2006-958412
日期:2007.1
The C-C bond-forming reaction between α-hydroxy- ketene-(S,S)-acetals 2 and active methylene compounds is described. Mediated by boron trifluoride etherate (BF 3 ·OEt 2 ), a series of C-C bond coupling products, 2-(2-acetyl-1-methyl-3-oxobutyl)-N-aryl-3,3-bis(ethylthio)acrylamides 3 was obtained in high to excellent yields by the reaction of 2a-e (R 1 = Ar) with acetylacetone. Various N-aryl-substituted
描述了 α-羟基-烯酮-(S,S)-缩醛 2 与活性亚甲基化合物之间的 CC 键形成反应。由三氟化硼醚合物 (BF 3 ·OEt 2 ) 介导,一系列 CC 键偶联产物,2-(2-乙酰基-1-甲基-3-氧代丁基)-N-芳基-3,3-双(乙硫基)丙烯酰胺通过 2a-e (R 1 = Ar) 与乙酰丙酮的反应,以高产率获得了 3。通过两步程序从 3 以高产率制备了各种 N-芳基取代的 3,4-二氢吡啶酮 5。在 2f (R 1 = H) 与活性亚甲基化合物反应后,3,4-二氢吡啶酮 6 和/或 7 在一锅反应中以中等至良好的产率获得。