Base- and Copper-Catalyzed Intramolecular Cyclization for the Direct Synthesis of Dihydrofurans
作者:Yong-Fei Chen、Hai-Fei Wang、Ya Wang、Yong-Chun Luo、Hai-Liang Zhu、Peng-Fei Xu
DOI:10.1002/adsc.201000005
日期:——
has been developed from the cyclization of 2‐propynyl‐1,3‐dicarbonyl compounds catalyzed by potassium tert‐butoxide, copper(II) trifluoromethanesulfonate and triphenylphosphine using methanol/dichloromethane as the solvent under very mild conditions. Moreover, dihydrofurans could be easily transformed into the corresponding furans in the presence of trifluoroacetic acid.
叔丁醇钾,三氟甲烷磺酸铜(II)和三苯基膦在非常温和的条件下以叔丁醇钾,三氟甲烷磺酸铜(II)和三苯膦为催化剂,环化了2-丙炔基-1,3-二羰基化合物,从而开发出一种简便的合成二氢呋喃的方法。。而且,在三氟乙酸的存在下,二氢呋喃可以容易地转化成相应的呋喃。