Palladium-catalyzed reaction between aryl or alkenyl halides and (1-carbalkoxy-1-alkenyl)zinc iodides. A new class of unmasked β-substituted acrylate α-anion equivalents
作者:Renzo Rossi、Adriano Carpita、Fabio Bellina、Paolo Cossi
DOI:10.1016/0022-328x(93)83005-g
日期:1993.6
β-substituted acrylate α-anion equivalents have been directly and very efficiently prepared by insertion of zinc metal into the carbon-iodine bonds of alkyl (E)- or (Z)-2-iodo-2-alkenoates, (E)-or (Z)-(4), respectively. The stereoisomeric composition of these new reagents, 12, depends on the experimental conditions used for their preparation. Their Pd0-catalyzed reaction with alkenyl or aryl halides
未掩蔽的β-取代的丙烯酸酯α-阴离子等价物都被直接和锌金属的插入非常有效地制备成的烷基(碳-碘键的ë) -或(ż)-2-碘-2-烯酸酯,(ë) -或(Z)-(4)。这些新试剂12的立体异构体组成取决于用于制备它们的实验条件。它们与可含有官能团的烯基或芳基卤化物的Pd 0催化反应,以化学收率高产率地导致相应的交叉偶联产物。当从化合物(Z)-4合成试剂12时或使用较长的反应时间进行制备,它们的交联产物结果富含具有(E)-构型的三取代双键的立体异构体。