Regioselective Cross-Coupling of Allylboronic Acid Pinacol Ester Derivatives with Aryl Halides via <i>Pd-PEPPSI-IPent</i>
作者:Jennifer L. Farmer、Howard N. Hunter、Michael G. Organ
DOI:10.1021/ja308613b
日期:2012.10.24
The cross-coupling reactions of allylboronic acid pinacol ester derivatives with aryl and heteroaryl halides occurred with high selectivity (>97%) at the α-carbon of the allylboron reagent in the presence of Pd-PEPPSI-IPent precatalyst and 5 M KOH in refluxing THF. In the case of trisubstituted allylboronates with different substituents on the olefin, minor olefin geometry isomerization was observed
在 Pd-PEPPSI-IPent 预催化剂和 5 M KOH 存在下,烯丙基硼酸频哪醇酯衍生物与芳基和杂芳基卤化物的交叉偶联反应以高选择性(> 97%)发生在烯丙基硼试剂的 α-碳上四氢呋喃。在烯烃上具有不同取代基的三取代烯丙基硼酸酯的情况下,观察到次要烯烃几何异构化(E/Z ≈ 80/20)。