A facile preparation of alkenyl- and allenylmetallic compounds by means of iodine-metal exchange and their use in organic synthesis
作者:Hiroshi Shinokubo、Hiroaki Miki、Toshiaki Yokoo、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1016/0040-4020(95)00700-i
日期:1995.10
Stereospecific lithium-halogen exchange of alkenyl iodides was performed upon treatment with butyllithium in non-polar solvents such as hexane, benzene, and toluene at 25 °C to provide alkenyllithiums quantitatively with retention of the configuration. Metal-iodine exchange of allenyl iodides with n-BuLi, i-PrMgBr or Et2Zn was also performed effectively to afford the corresponding allenylmetallic reagents
在非极性溶剂(如己烷,苯和甲苯)中于25°C用丁基锂处理后,进行烯基碘的立体定向锂-卤素交换,以定量提供具有构型保留的烯基锂。还有效地进行了烯基碘化物与n -BuLi ,i -PrMgBr或Et 2 Zn的金属-碘交换,从而提供了相应的烯基金属试剂。在金属试剂中加入羰基化合物可得到具有高区域选择性的均丙炔醇,收率很高。