1,2-Bis(diphenylphosphino)carborane As a Dual Mode Ligand for Both the Sonogashira Coupling and Hydride-Transfer Steps in Palladium-Catalyzed One-Pot Synthesis of Allenes from Aryl Iodides
作者:Hiroyuki Nakamura、Takaya Kamakura、Shinya Onagi
DOI:10.1021/ol060538v
日期:2006.5.1
One-pot allene synthesis from aryl iodides 1 and propargyldicyclohexylamine 2 proceeded in the presence of Pd(2)(dba)(3).CHCl(3) catalyst (2.5 mol %), 1,2-bis(diphenylphosphino)carborane 5 (10 mol %), CuI (15 mol %), and Et(3)N (150 mol %) to give the corresponding allenes 4 in good to high yields. Electron-deficient bidentate phosphines, such as 1,2-bis(diphenylphosphino)carborane 5 and (C(6)F(5))
[反应:参见正文]在Pd(2)(dba)(3).CHCl(3)催化剂(2.5 mol%),1,2-bis的存在下,从芳基碘化物1和炔丙基二环己胺2一锅法合成丙二烯(二苯基膦基)碳硼烷5(10摩尔%),CuI(15摩尔%)和Et(3)N(150摩尔%)以良好至高收率得到相应的烯丙基4。电子不足的双齿膦,例如1,2-双(二苯基膦基)碳硼烷5和(C(6)F(5))(2)PC(2)H(4)P(C(6)F(5) )(2),在Sonogashira偶联和氢化物转移反应中均起着双模配体的作用。