Reaction of magnesium alkylidene carbenoids with lithium acetylides and lithium thiolates: a novel synthesis of conjugated enynes and vinyl sulfides
作者:Masanori Watanabe、Masatomo Nakamura、Tsuyoshi Satoh
DOI:10.1016/j.tet.2005.02.084
日期:2005.5
carbenoids were generated from 1-chlorovinyl p-tolyl sulfoxides with i-PrMgCl at −78 °C in THF or toluene via the sulfoxide–magnesium exchange reaction. Reaction of the generated magnesium alkylidene carbenoids with lithium acetylides or lithium thiolates gave conjugated enynes or vinyl sulfides, respectively, in moderate to good yields. The intermediate of this reaction was found to be the alkenyl anion and
亚烷基镁的类胡萝卜素是在1-78℃于THF或甲苯中,由1-氯乙烯基对甲苯基亚砜与i -PrMgCl经由亚砜-镁交换反应生成的。产生的亚烷基镁类胡萝卜素与乙炔化锂或硫醇锂反应,分别以中等至良好的产率得到共轭烯炔或乙烯基硫化物。发现该反应的中间体是链烯基阴离子,它可以被一些亲电试剂捕获,得到四取代的共轭烯炔和乙烯基硫化物。