RSO2M, where R is as defined previously and M is an alkali metal, to obtain a compound of formula QUIN-2; or (2) reacting a compound of formula 7 with a compound RASO2Cl wherein RA is an electron rich arene group, in the presence of a suitable base, and then reacting the resulting compound in situ, under acidic conditions, with a sulfinate salt RSO2M, where R is as defined previously, wherein M is