Scheme 2. Synthesis of Target Compounds 13a–13ha.
aReagents and conditions: (a) hydrazine monohydrate, CH3OH, reflux, yield 95%; (b) different aliphatic aldehyde, MgSO4, CH3CH2OH, yield 98%; (c) NaBH3CN, CH3OH, concentrated hydrochloric acid, 60%.
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