Equilibrating C−S Bond Formation by C−H and S−S Bond Metathesis. Rhodium-Catalyzed Alkylthiolation Reaction of 1-Alkynes with Disulfides
作者:Mieko Arisawa、Kenji Fujimoto、Satoshi Morinaka、Masahiko Yamaguchi
DOI:10.1021/ja0527121
日期:2005.9.1
slightly modified conditions. The C-S bond-forming reaction is reversible: A reaction of a thiol and a 1-alkylthio-1-alkyne in the presence of the rhodium catalyst gave a 1-alkyne; alkylthio exchange reaction proceeded between a 1-alkylthio-1-alkyne and a disulfide. This is an equilibrating oxidative reaction of organic molecules with C-H and S-S bond metathesis forming C-S and S-H bonds.
在催化量的 RhH(PPh3)4 (2 mol %) 和 1,1'-双(二苯基膦)二茂铁 (dppf) (3 mol %) 存在下,甲硅烷基乙炔与二烷基二硫化物反应得到 1-烷硫基-2-高产率的三烷基甲硅烷基乙炔。在该反应中释放的烷硫醇不会干扰反应,并且在该条件下可以最大限度地减少加成到甲硅烷基乙炔中形成 1-烷硫基-1-烯烃的情况。当烷基或芳基较大时,烷基乙炔和芳基乙炔也会与二硫化物反应。二芳基二硫化物在稍微改变的条件下产生芳硫基衍生物。CS键形成反应是可逆的:硫醇和1-烷硫基-1-炔烃在铑催化剂存在下反应得到1-炔烃;1-烷硫基-1-炔烃与二硫化物发生烷硫基交换反应。