Stereoselective synthesis of constrained oxacyclic hydroxyethylene isosteres of aspartyl protease inhibitors. Nitroaldol methodology toward 2,3-substituted tetrahydrofurans
作者:Stephen Hanessian、Martin Brassard
DOI:10.1016/j.tet.2004.06.060
日期:2004.8
heterobimetallic Binol lanthanide, and Trost dinuclear zinc catalysts were studied in a nitroaldol reaction of 3-methyl-1-nitrobutane with a chiral non-racemic tetrahydrofuran aldehyde. Other methods utilized KF, Amberlyst A-21, and t-BuOK as bases for the same nitroaldol reaction. The major isomer in the Binol lanthanide and dinuclear zinc catalyzed reactions was the syn/syn-nitroaldol product. Structures were
在3-甲基-1-硝基丁烷与手性非外消旋四氢呋喃醛的硝基羟醛反应中研究了Shibasaki异双金属化的Binol镧系元素和Trost双核锌催化剂。其他方法利用KF,Amberlyst A-21和t - BuOK作为相同硝基醛醇反应的碱。Binol镧系元素和双核锌催化反应中的主要异构体是syn / syn-硝基醛醇产物。通过单晶X射线晶体学确认结构。将主要的硝基醛醇异构体转化为含有γ,δ-氨基醇支链的2,3-取代的四氢呋喃2-羧酸,其对应于天冬氨酰蛋白酶抑制剂的羟基乙烯等排体的受限氧杂环类似物。