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Synthesis of title compounds. Reagents and conditions: a) THF/NaOEt and diethyl oxalate; b) EtOH and NH2NH2.H2O; c) MeOH/THF/H2O, LiOH; d) aniline or amine derivative, EDC/DMAP in DCM (R groups are the aniline or amine derivatives that is listed in Table 1).
