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Synthesis of 26a-26c, 28a-28e.
Reagents and conditions: (a) 1,1-dimethylhydrazine, pyrrolidin-1-amine, piperidin-1-amine or pyrazolidine, TBTU, TEA, DMF, yield 50–60%; (b) TFA, DCM, yield 60–65%. (c) ethanal, propanal, n-butanal, n-pentanal, n-hexanal, NaBH3CN, CH3COOH, methanol, yield 50–60%.
