Cesium Carbonate Mediated Borylation of Aryl Iodides with Diboron in Methanol

Herein we describe the unexpected borylation of aryl iodides promoted by a Cs2CO3 and MeOH system. This formal nucleophilic boryl substitution could be applied to a wide range of functionalized aryl iodide compounds. The preliminary results indicate that this process is neither copper catalyzed nor radical mediated. Transition‐metal free! The unexpected borylation of aryl iodides promoted by Cs2CO3 and MeOH is revealed. This formal nucleophilic boryl substitution can be applied to a wide range of functionalized aryl iodide compounds. The preliminary results indicate that this process is neither copper catalyzed nor radical mediated (pin = pinacolato, OCMe2CMe2O; neop = neopentylglycolato, OCH2CMe2CH2O).