How is 2,3-Dihydro-1-benzofuran-7-ylboronic acid (CAS: 685514-61-8) typically synthesized?

2,3-Dihydro-1-benzofuran-7-ylboronic acid is typically synthesized through the boronation of 2,3-dihydro-1-benzofuran-7-ylboronic ester using a catalytic system. Common methods include the use of tetrakis(triphenylphosphine)palladium(0) as a catalyst, with triphenylphosphine as a ligand. The reaction proceeds under basic conditions with the boronic acid being generated in situ from the boronic ester. The yield is generally high, around 80-90%, with good selectivity.