Scheme 1. Synthesis of Compounds 6–8a.
aReagents: (a) NH2NH2·H2O; (b) (1) MnO2, dioxane, (2) 1-methylmaleimide or 1,3-dimethylmaleimide, THF, reflux; (c) NaBH4, BF3·(OEt)2, THF; (d) BBr3, CH2Cl2.
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