chloride salt, was found to play a key role in the Pd(0)-catalyzed Heck reaction of aryl nonaflates and terminal alkenes. In the presence of PdCl2(PPh3)2, NaI or TBAI in DMF, a class of 2-(1-alkenyl)phenylphosphonates was first synthesized via the reaction of o-phosphonylphenyl nonaflates with alkenes, the yields, regioselectivities and stereoselectivities were much dependent on the nature of the substituents
发现
碘化物盐,例如NaI,KI或n- Bu 4 NI(TBAI),而不是
溴化物或
氯化物盐,在Pd(0)催化的芳基
壬二酸酯和末端烯烃的Heck反应中起关键作用。在
DMF中存在PdCl 2(PPh 3)2,NaI或TBAI时,首先通过邻位反应生成一类2-(1-烯基)
苯基膦酸酯-膦酰基苯基
壬酸酯与烯烃的产率,区域选择性和立体选择性在很大程度上取决于取代基的性质。在芳基
壬酸酯不与烯烃带有空间位阻膦酰基的情况下,反应在相同条件下进行得更平稳,从而以良好或极好的收率选择性地产生线性产物。讨论了这种反应的原理。