Bis-<i>tert</i>
-Alcohol-Functionalized Crown-6-Calix[4]arene: An Organic Promoter for Nucleophilic Fluorination
作者:Vinod H. Jadhav、Wonsil Choi、Sung-Sik Lee、Sungyul Lee、Dong Wook Kim
DOI:10.1002/chem.201504602
日期:2016.3.18
The role of BACCA was revealed to be separation of the metal fluoride to a large distance (>8 Å), thereby producing an essentially “free” F−. The synergistic actions of the crown‐6‐calix[4]arene subunit (whose O atoms coordinate the counter‐cation Cs+) and the terminal tert‐alcohol OH groups (forming controlled hydrogen bonds with F−) of BACCA led to tremendous efficiency in SN2 fluorination of base‐sensitive
甲二-叔-醇官能冠-6-杯[4]芳烃(浆果)被设计并作为与亲核的CsF氟化反应的多官能有机启动子制备。通过形成CsF / BACCA复合物,BACCA可以释放出具有显着活性和选择性的氟化物源,用于S N 2氟化反应。通过量子化学方法研究了BACCA促进作用的起源。浆果的作用显露是金属氟化物分离到一个大的距离(> 8),从而产生基本上“自由” F - 。冠-6-杯的协同作用[4]芳烃亚基(其O原子坐标抗衡阳离子铯+)与终端叔-醇OH基团(形成有F控制氢键- )的浆果导致S中巨大效率Ñ 2氟化碱敏感的底物。