Pd-PEPPSI-IPent-SiO<sub>2</sub>: A Supported Catalyst for Challenging Negishi Coupling Reactions in Flow
作者:Gregory A. Price、Abbas Hassan、Nalin Chandrasoma、Andrew R. Bogdan、Stevan W. Djuric、Michael G. Organ
DOI:10.1002/anie.201708598
日期:2017.10.16
precatalyst, Pd‐PEPPSI‐IPent‐SiO2, has been prepared and evaluated for its proficiency in the Negishi cross‐coupling of hindered and electronically deactivated coupling partners. The precatalyst Pd‐PEPPSI‐IPent loaded onto packed bed columns shows high catalytic activity for the room‐temperature coupling of deactivated/hindered biaryl partners. Also for the first time, the flowed Csp3–Csp2 coupling of secondary
制备了二氧化硅负载的预催化剂Pd-PEPPSI-IPent-SiO 2,并对其在受阻和电子失活偶合剂的Negishi交叉偶联中的应用能力进行了评估。填充床色谱柱上的预催化剂Pd-PEPPSI-IPent对失活/受阻联芳基伴侣的室温偶联表现出高催化活性。同样也是第一次,使用Pd-PEPPSI-IPent-SiO 2以高选择性实现了烷基仲锌试剂与(杂)芳族化合物的流动Csp 3 –Csp 2偶联。这些偶联剂需要短至3分钟的停留时间,即可完成这些具有挑战性的转化,并对非重排产物具有出色的选择性。