Highly regio- and stereo-selective carbometallation reaction of fluorine-containing internal acetylenes with organocopper reagents
作者:Tsutomu Konno、Takeshi Daitoh、Atsushi Noiri、Jungha Chae、Takashi Ishihara、Hiroki Yamanaka
DOI:10.1016/j.tet.2005.07.022
日期:2005.9
The carbometallation reactions of fluoroalkylated internal alkynes with various organocopper reagents derived from organolithium, Grignard, and organozinc reagents were examined. All carbocupration reactions proceeded smoothly in a highly regio- and stereo-selective manner to give the corresponding vinylcopper intermediates. The intermediates reacted with H+ smoothly, leading to the trisubstituted
考察了氟代烷基化内部炔烃与衍生自有机锂,格利雅(Grignard)和有机锌试剂的各种有机铜试剂的碳金属化反应。所有的碳吸收反应均以高度区域选择性和立体选择性的方式顺利进行,得到相应的乙烯基铜中间体。中间体与H +反应平稳地生成三取代烯烃,产率高至优异,而它们仅与严格限定的碳亲电试剂(如烯丙基,巴豆基,甲基烯丙基溴等)反应,这可能是由于吸电子氟代烷基的低反应性所致。用碘处理乙烯基铜导致相应的乙烯基碘的高收率,已成功用于铃木-宫浦和Sonogashira的交叉偶联反应。此外,碳键合和铃木-宫浦交叉偶联反应这两个关键反应实现了抗雌激素药泛美芬的第一个高度立体选择性的全合成。