A series of 5-aryl- and 5-heteroaryl-7-carboxyl-8-hydroxyquinaldines
were prepared from 5-bromo-7-methoxycarbonyl-8-benzyloxyquinaldine
based on the Suzuki cross-coupling reaction using potassium organotrifluoroborates.
An efficient method of deprotection of the 8-hydroxy group using
a microwave-assisted hydrogen transfer reaction is reported.
quinolines - cross-coupling - boron - palladium - arylations