The majority of synthetic strategies for the pyranonaphthoquinones involve building the pyran system on a suitably substituted naphthalene ring by various methodologies, followed by oxidation of the naphthopyran, thereby generating the desired pyranonaphthoquinone. It was therefore quite logical that a system with suitable substituents at the desired positions on naphthalene core is of utmost importance. For example, a synthon 2-allyl-3-bromo-1,4- ...
