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aReagents and conditions: (a) RI, NaHCO3, DMF, microwave irradiation, 165 °C, 12 min, 64% for 8a and 87% for 8b; (b) RBr, NaHCO3, DMF, microwave irradiation, 165 °C, 12 min, 48% for 9a, 51% for 9b, 47% for 9c, and 47% for 9d; (c) NaCN, DMSO, 50 °C, 12 h, 98% for 10a; (d) imidazole, K2CO3, DMSO, rt, 14 h, 41% for 10b.
