作者:Wangbing Li、Zhichao Lu、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.orglett.1c03887
日期:2021.12.17
An unbalanced ion pair promoter (e.g., tetrabutylammonium sulfate), consisting of a bulky and charge-delocalized cation and a small and charge-localized anion, greatly accelerates nucleophilic fluorinations using easy handling KF. We also successfully converted an inexpensive and commercially available ion-exchange resin to the polymer-supported ion pair promoter (A26–SO42–), which could be reused
不平衡的离子对促进剂(例如,四丁基硫酸铵)由大体积的电荷离域阳离子和小电荷局部阴离子组成,使用易于处理的 KF 极大地加速了亲核氟化。我们还成功地将廉价且市售的离子交换树脂转化为聚合物负载的离子对促进剂 (A26–SO 4 2– ),过滤后可重复使用。此外,A26–SO 4 2–可用于连续流动条件。在我们的条件下,水的耐受性良好。