Reaction of enol ethers with zinc carbenoid reagents. Cyclopropanation and subsequent isomerization to allylic ethers
作者:Ilhyong Ryu、Tomoyuki Aya、Shoji Otani、Shinji Murai、Noboru Sonoda
DOI:10.1016/0022-328x(87)80300-5
日期:1987.4
reactions of enol ethers (ROCC, R = alkyl, silyl) with zinc carbenoid reagents were found to give allylic ethers in several cases along with the expected cyclopropyl ethers. The ratio of these two products was highly dependent on the concentration of the reaction mixture. Thus, the selective formation of each product was conveniently attained by merely changing the amounts of the solvent used. Zinc iodide
发现烯醇醚(ROCC,R =烷基,甲硅烷基)与类胡萝卜素锌试剂的反应在某些情况下与预期的环丙基醚一起生成烯丙基醚。这两种产物的比例高度依赖于反应混合物的浓度。因此,通过仅改变所用溶剂的量就可以方便地实现每种产物的选择性形成。该反应的副产物碘化锌在本发明的环丙基至烯丙基重排中起关键作用。提出了开环的离子中间体。