Scheme 2.
Reagents and conditions: (i) for 9a–9e, Et3N, DMF, 25 °C, 24 h; for 10f and 11f, K2CO3, KI, DMF, 25 °C, 24 h (ii) H2, 10%Pd/C, THF/EtOH, 12 h.
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