Catalyst-Controlled Ring-Opening Cycloisomerization Reactions of Cyclopropenyl Carboxylates for Highly Regioselective Synthesis of Different 2-Alkoxyfurans
作者:Jie Chen、Shengming Ma
DOI:10.1002/asia.201000324
日期:2010.11.2
Differently substituted 2‐alkoxyfurans (2,3,4‐ or 2,3,5‐trisubstituted furans) were highly regioselectively synthesized by means of the ring‐opening cycloisomerization of the same cyclopropenyl carboxylates with good yields in different solvents and excellent regioselectivity by using [Cu(acac)2] (acac=acetylacetonate) or [RuCl2(PPh3)3] as the catalyst, respectively. The structures of these two different
通过相同环丙烯基羧酸酯的开环环异构化,在不同溶剂中具有良好的收率,并通过使用优异的区域选择性,可以高度区域选择性地合成不同取代的2-烷氧基呋喃(2,3,4-或2,3,5-三取代呋喃)分别作为催化剂的[Cu(acac)2 ](acac =乙酰丙酮)或[RuCl 2(PPh 3)3 ]。这两种不同类型的呋喃的结构是通过X射线衍射研究确定的。已经提出了基本原理。