... Volume: Page: Digital Object Identifier (DOI). ... Scheme 5 a. a Reagents: (a) DAIB, toluene; (b) p-TsCl, pyridine, reflux; (c) PhI(OCOCF 3 ) 2 , MeOH. Functionalization of the hydroxy group of the benzothiazole quinol 7a has also been carried out. ...