Palladium-Catalyzed <i>anti</i>-Hydrothiolation of 1-Alkynylphosphines
作者:Azusa Kondoh、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1021/ol0702876
日期:2007.3.1
Treatment of 1-alkynylphosphine with thiol in the presence of a catalytic amount of palladium acetate results in regio- and stereoselective anti-hydrothiolation, yielding the corresponding (Z)-1-phosphino-2-thio-1-alkene.
Rhodium-Catalyzed Reaction of 1-Alkynylphosphines with Water Yielding (<i>E</i>)-1-Alkenylphosphine Oxides
作者:Azusa Kondoh、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/bcsj.81.502
日期:2008.4.15
Treatment of 1-alkynylphosphines with a rhodium catalyst in 1,4-dioxane/H2O at reflux provides (E)-1-alkenylphosphine oxides in good yields with perfect stereoselectivity. The reaction proceeds as follows. Oxidative addition of 1-alkynylphosphine to rhodium followed by hydrolysis yields the corresponding terminal alkyne and diphenylphosphine oxide. Rhodium-catalyzed hydrophosphinylation of the terminal alkyne then proceeds to afford (E)-1-alkenylphosphine oxide.
Copper-Catalyzed anti-Hydrophosphination Reaction of 1-Alkynylphosphines with Diphenylphosphine Providing (<i>Z</i>)-1,2-Diphosphino-1-alkenes
作者:Azusa Kondoh、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1021/ja070048d
日期:2007.4.1
nes and their sulfides. The reaction is highly chemoselective and can be performed even in an aqueous medium. The reaction is reliable enough to realize a gram-scale synthesis of (Z)-1,2-diphosphino-1-alkene. Radical reduction of the diphosphine disulfides with tris(trimethylsilyl)silane yields the parent trivalent diphosphines without suffering from the isomerization of the olefinic geometry. Enantioselective