The Heck arylation of mono- and disubstituted olefins catalyzed by palladium supported on alumina-based oxides
作者:Ewa Mieczyńska、Andrzej Gniewek、Iweta Pryjomska-Ray、Anna M. Trzeciak、Hanna Grabowska、Mirosław Zawadzki
DOI:10.1016/j.apcata.2010.11.041
日期:2011.2
With the same catalysts, good results, up to 97% yield of ethyl β-phenylcinnamate (3), were also obtained in the coupling of bromobenzene with ethyl cinnamate. The three most active catalysts, Pd(0)/Al2O3, Pd(II)/Al2O3, and Pd(II)/Al2O3–Fe2O3, were applied in the Heck cross-coupling of cinnamates with different bromobenzene and iodobenzene derivatives, leading to β-arylcinnamate products. The highest
通过醇盐溶胶-凝胶法(Al 2 O 3,Al 2 O 3 -ZrO 2,Al 2 O 3 -ZrO 2 -Eu 2制备)负载在氧化铝基混合氧化物上的含Pd(0)或Pd(II)的钯催化剂O 3,Al 2 O 3 –MgO,Al 2 O 3 –CeO 2,Al 2 O 3 –Fe 2 O 3)在DMF溶剂中对溴苯与丙烯酸丁酯的Heck偶联非常有效。在过量的溴苯存在下,4小时后形成肉桂酸丁酯(1)作为主要产物。使用相同的催化剂,在溴苯与肉桂酸乙酯的偶联中也获得了良好的结果,β-苯基肉桂酸乙酯(3)的产率高达97%。三种活性最高的催化剂Pd(0)/ Al 2 O 3,Pd(II)/ Al 2 O 3和Pd(II)/ Al 2 O 3 –Fe 2 O 3分别用于肉桂酸与不同的溴苯和碘苯衍生物的Heck交叉偶联,生成β-芳基肉桂酸酯产品。当碘代茴香醚和肉桂醛用作底物时,观察到最高产率。通过TEM测量证