Synthesis of α-Methylene-β-hydroperoxy Sulfoxides by Regioselective Photooxygenation (Schenck Reaction) of Racemic Vinyl Sulfoxides
作者:Waldemar Adam、A. Sampath Kumar、Chantu R. Saha-Möller
DOI:10.1055/s-1995-4138
日期:1995.12
The β-hydroperoxy vinyl sulfoxides 3 were synthesized in good to excellent yields by regioselective photooxygenation of racemic vinyl sulfoxides 2. Moderate diastereoselectivities were observed in the ene reaction of singlet oxygen (Schenck Reaction) with the E- or Z-vinyl sulfoxides 2e. Titanium-catalyzed oxygen transfer reaction of these sulfoxy-functionalized racemic allylic hydroperoxides 3 resulted chemoselectively in the corresponding sulfones 5.
β-Phenylthioalkyltitanium reagent prepared by the hydrotitanation of alkenyl sulfide using triethylsilane and titanium tetrachloride is found to react with aromatic aldehyde or α,β-unsaturated ketone to give the corresponding γ-hydroxyalkyl sulfide or δ-phenylthio ketone, respectively.
A cross-aldol type reaction of alkenyl sulfide with trimethylsilyl enol ether.
作者:Takeshi Takeda、Yuichiro Kaneko、Tooru Fujiwara
DOI:10.1016/s0040-4039(00)84708-5
日期:1986.1
β-Phenylthio ketones were obtained in good yields by the successive treatment of alkenyl sulfides with TiCl4 -ROH (R= Me or t-Bu) and trimethylsilylenolethers.
2-(Phenylthio)alkanenitriles, homoallyl sulfides, and thioacetals were obtained in good yields by the reaction of alkenyl sulfides with the corresponding silyl nucleophiles via thionium ion intermediates.