Scheme 3.
Synthesis of compounds P9‒P10. Reagents and condition: (a) hexamethylenetetramine, CF3COOH, 120 °C, 10 h, 10%; (b) DMF, Cs2CO3, 80 °C, 2 h, 75%; (c) appropriate amine, NaBH(OAc)3, CH2Cl2, rt, 6–10 h, 40%–55%.
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