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Reagents and conditions: (a) Cu, K2CO3, pentanol, 110 °C; (b) POCl3, 120 °C; (c) DMPU, P4S10, 95 °C; (d) PPA, 110 °C; (e) Lawesson’s reagent, THF, MW at 110 °C; (f) BrCH2(CH2)nY, KOH, TBAI (cat.), toluene, H2O, 110 °C; (g) BrCH2(CH2)nNH2·HBr, phenol, 80 °C; (h) 4 N HCl in 1,4-dioxane, MeOH, rt.
