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Reagents and conditions: (a)365 Pd(PPh3)4, 2 M Na2CO3, 1,2-dimethoxyethane, 115 °C, 48 h; (b) BBr3, dry DCM, rt, 48 h; (c) hydrazine monohydrate (80%), DMSO/i-PrOH, 140 °C, 72 h; (d) PbO2, dry DCM, rt, 30 min.
