Highly diastereoselective vinylogous Mukaiyama aldol reaction of α-keto phosphonates with 2-(trimethylsilyloxy)furan catalyzed by Cu(OTf)2
作者:Jipan Yu、Xiaona Zhao、Zhiwei Miao、Ruyu Chen
DOI:10.1039/c1ob05822c
日期:——
achieved via a vinylogous Mukaiyama aldol reaction. The reaction was performed using α-ketophosphonate 1 and 2-(trimethylsilyloxy)furan 2 mediated by Cu(OTf)2 and 2,2,2-trifluoroethanol as additive in CH2Cl2. The reaction proceeds rapidly and affords the corresponding 5-(hydroxy(aryl)methyl) furan-2(5H)-one phosphonates 3 in high yields with good to excellent diastereoselectivities (d.r. up to >99 : 1)
δ-羟烷基丁烯内酯膦酸酯的非对映特异性形成是通过乙烯基类的Mukaiyama aldol反应实现的。反应是使用α-酮膦酸酯1和2-(三甲基甲硅烷氧基)呋喃2介导的,Cu(OTf)2和2,2,2-三氟乙醇作为CH 2 Cl 2中的添加剂。反应迅速进行,并以高收率和良好至优异的非对映选择性(dr高达> 99∶1)提供相应的5-(羟基(芳基)甲基)呋喃-2(5H)-一膦酸酯3。还可以以良好的非对映选择性获得5-(羟基(烷基)甲基)呋喃-2(5 H)-一膦酸酯。