How is (2-Aminophenyl)boronic acid hydrochloride (CAS: 863753-30-4) typically synthesized?

(2-Aminophenyl)boronic acid hydrochloride can be synthesized through the reaction of 2-aminophenol with boron trifluoride in the presence of an acid catalyst, such as hydrochloric acid, followed by the addition of water to form the hydrochloride salt. The reaction is performed under mild conditions, and the yield is typically around 70-80%. This method is widely used in the preparation of boronic acid derivatives for various applications.