Highly regio- and stereocontrolled SN2′ reactions of gem-difluorinated vinyloxiranes with monoalkylcopper reagents
作者:Hisanori Ueki、Takashi Chiba、Takashi Yamazaki、Tomoya Kitazume
DOI:10.1016/j.tet.2005.09.018
日期:2005.11
Reaction of gem-difluorinated vinyloxiranes with RCu(X)Li allowed us to introduce the R group regioselectively at the fluorine-attached terminal carbon atom in an SN2′ manner to afford (E)-allylic alcohols exclusively, while homoallylic alcohols with anti stereochemical relationship were found to be obtained selectively from higher-ordered cuprates derived from CuCl and RMgBr in a ratio of 1:3.
的反应宝石-difluorinated vinyloxiranes与RCU(X)栗允许我们在一个S的氟附着末端碳原子区域选择性地引入R基团Ñ 2'的方式,得到(ë) -烯丙基醇排他地,而高烯丙基醇与抗立体化学关系被发现是从高比重的CuCl和RMgBr以1:3的比例得到的。