Stereospecific Construction of Chiral Tertiary and Quaternary Carbon by Nucleophilic Cyclopropanation with Bis(iodozincio)methane
作者:Kenichi Nomura、Seijiro Matsubara
DOI:10.1002/asia.200900289
日期:2010.1.4
The reaction of a ketone having a leaving group at the α‐position, such as α,β‐epoxy ketone or α‐sulfonyloxy ketone, with bis(iodozincio)methane affords a zinc alkoxide of cyclopropanol. The reaction proceeds by nucleophilic addition of the dizinc to the carbonyl group and a sequential intramolecular nucleophilic substitution of the introduced iodozinciomethyl group to the adjacent electrophilic carbon
带有α-位离去基团的酮(如α,β-环氧酮或α-磺酰氧基酮)与双(碘嗪)甲烷的反应可制得环丙醇的烷氧基锌。该反应通过将二锌亲核加成到羰基上并且将引入的碘嗪金属甲基顺序地分子内亲核取代到具有离去基团的相邻亲电子碳上而进行。用二锌处理旋光性α,β-环氧酮或α-磺酰氧基酮时,得到的环丙烷环中具有手性叔碳或季碳的环丙醇的烷氧基锌,得到的环丙醇的烷氧基锌用作手性均烯酸酯。在氰化铜存在下用亲电试剂处理时,