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(a) H2, Pd/C, MeOH, rt; (b) 2-chloro-N,N-diethylethylamine hydrochloride, K2CO3, KI, methyl ethyl ketone, reflux; (c) iodoethane, toluene, 90 °C; (d) 1,2-dibromoethane, K2CO3, KI, methyl ethyl ketone, reflux; (e) NaI, acetone, reflux; (f) triethylamine, toluene, rt for 7, reflux for 22; and (g) 1-bromo-2-chloroethane, K2CO3, N,N-dimethylformamide (DMF), 60 °C.
