A new synthesis of α-fluorovinylsulfones utilizing the Peterson olefination methodology
作者:Noriaki Asakura、Yoshinosuke Usuki、Hideo Iio
DOI:10.1016/s0022-1139(03)00194-5
日期:2003.11
are readily prepared from fluoromethyl phenyl sulfone and the appropriate silyl chloride. The use of TBSCl improves both the stability and yield of 1. Lithium derivatives 4 undergo a smooth Peterson olefination reaction with less-enolizable carbonyl compounds to give moderate to good yields of the expected α-fluorovinylsulfones 6, in some cases with high E-stereoselectivity. One-pot reaction with 4
α-氟-α-甲硅烷基取代的砜1可以容易地由氟甲基苯基砜和适当的甲硅烷基氯制备。TBSCl的使用可提高1的稳定性和收率。锂衍生物4与不太可烯化的羰基化合物进行平稳的Peterson烯化反应,以中等至良好的产率得到预期的α-氟乙烯基砜6,在某些情况下具有高E-立体选择性。一锅反应与由氟甲基苯基砜在四氢呋喃(THF)中原位生成的4反应也顺利进行,尤其是与醛反应时。