An efficient and highly stereoselective synthesis of novel trifluoromethylated trans-dihydrofuro[2,3-c]pyrazoles using arsonium ylides
作者:Jiaping Zhang、Shuxin Yang、Kai Zhang、Jie Chen、Hongmei Deng、Min Shao、Hui Zhang、Weiguo Cao
DOI:10.1016/j.tet.2012.01.030
日期:2012.3
An efficient approach of highly stereoselective synthesis of novel trifluoromethylated trans-4,5-dihydrofuro[2,3-c]pyrazoles has been described. Arsonium bromides 1 reacted smoothly with the electron-deficient alkenes (Z)-4-aryl-1-phenyl-3-(trifluoromethyl)-1H-pyrozol-5(4H)-ones 2 to give products trans-dihydrofuro[2,3-c]pyrazoles 3 with high stereoselectivity and in good to excellent yields, using
已经描述了新型三氟甲基化反式-4,5-二氢呋喃[2,3- c ]吡唑的高立体选择性合成的有效方法。鉮溴化物1与缺电子烯烃(平滑反应Ž)-4-芳基-1-苯基-3-(三氟甲基)-1 ħ -pyrozol-5(4 ħ) -酮2,得到的产品反式-dihydrofuro [2使用CH 2 Cl 2作为溶剂和K 2 CO 3作为碱,具有高立体选择性和良好至极佳产率的1,3- c ]吡唑3。