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ChemInform Abstract The chlorodinitrobenzotrifluorides (I) and (IV) mentioned in the title react with methyl thioglycolate (II) and triethylamine at room temperature, forming the benzothiazole N-oxides (III) or (V). (V) is converted to the nitroso derivatives (VI) upon refluxing with further (II). (IV) is coupled with the α-amino esters (VII) at room temperature, yielding the phenylamino esters (VIII). Reactions of (IV) with (VIIa) in refluxing ethanol, however, yields the ring closure products (IX) and (X).