Selective Synthesis of 3-Methylene-2,3-dihydrofurans or 1,2,4-Trisubstituted Furans via Tandem Reactions of Allenic Ketones with α-Chloro β-Keto Esters or Ketones
作者:Xuesen Fan、Qiang Wang、Lei Yang
DOI:10.1055/s-0033-1340671
日期:——
Novel and efficient synthesis of functionalized furan derivatives have been developed in this paper. Promoted by K2CO3, allenic ketones underwent tandem reactions with 2-chloroacetoacetate or 3-chloropentane-2,4-dione to afford 3-methylene-2,3-dihydrofurans with high efficiency under remarkably mild conditions. When the same substrates were treated with potassium carbonate and triphenylphosphine, on
本文开发了功能化呋喃衍生物的新型高效合成方法。在 K2CO3 的促进下,丙二烯酮与 2-氯乙酰乙酸酯或 3-氯戊烷-2,4-二酮进行串联反应,在非常温和的条件下高效地得到 3-亚甲基-2,3-二氢呋喃。另一方面,当相同的底物用碳酸钾和三苯基膦处理时,可以以良好的收率获得 1,2,4-三取代呋喃。