Activation of the Vinylic C−Cl Bond by Complexation of Fe(CO)<sub>3</sub>: Palladium-Catalyzed Coupling Reactions of (η<sup>4</sup>-Chlorodiene)tricarbonyliron Complexes
作者:Qian Chen、Chaozhong Li
DOI:10.1021/om0606800
日期:2007.1.1
The reactions of 1-chloro- or 2-chloro-substituted (η4-1,3-cyclohexadiene)Fe(CO)3 complexes with terminal alkynes under the catalysis of PdCl2(PPh3)2/CuI at 45−60 °C led to the formation of the corresponding Sonogashira coupling products in 64−97% yields. The complexes also underwent smoothly the intermolecular Heck reactions with activated alkenes under the catalysis of Pd(OAc)2/PPh3 at 60 °C to afford
1-氯或所述反应的2-氯-取代的(η 4 -1,3-环己二烯)的Fe(CO)3种配合物的PdCl的催化下末端炔2(PPH 3)2在45-60 /°的CuI C导致以64-97%的产率形成相应的Sonogashira偶联产物。在Pd(OAc)2 / PPh 3的催化下,配合物还顺利地与活化烯烃进行了分子间的Heck反应。在60°C下以39-83%的产率提供预期的偶联产物。另一方面,相应的未络合分子2-氯-1,3-环己二烯在相同反应条件下保持惰性。这些结果清楚地证明了Fe(CO)3对乙烯基C-Cl键的氧化裂解具有很强的活化作用。