zinc bromides and regioconvergent Negishi coupling with aryl or alkenyl triflates. The use of a suitable phosphine ligand favoring Pd migration enabled the selective formation of the linear cross‐coupling product. Subsequently, mixtures of secondary alkyl bromides were prepared from linear alkanes by standard bromination, and regioconvergent cross‐coupling then provided access to the corresponding linear
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