Original version
Frontiers in Chemistry. 2022, 10:884478, DOI: https://doi.org/10.3389/fchem.2022.884478
Abstract
A tris(pentafluorophenyl)borane catalysed method for the synthesis of boronic acid esters from aromatic amines in yields of up to 93% was devised. Mild conditions, benign reagents, short reaction times, low temperatures and a wide substrate scope characterize the method. The reaction was found applicable to the synthesis of boronic acid ester derivatives of complex drug molecules in up to 86% isolated yield and high purity suitable for labelling. These boronates were subsequently labelled with [ 18 F]fluoride ion in radiochemical yields of up to 55% with and even without isolation of the boronate-intermediate.