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Reagents and conditions. (i) Pd(PPh3)4, Cs2CO3, DME/H2O (2:1), mw, 140 °C, 30 min, 100 W, 67–78%; (g) LiAlH4, THF dry, 0 °C, 30 min, 56–82%; (h) PPh3, DEAD, THF dry, r.t., 18 h, 72–88%; (b) hydrazine, DCM, r.t., 2 h, 92–96%.
