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Reagent and conditions: (a) AcOH, rt, 2.5 h; (b) 98% H2SO4, rt, 18 h; (c) DMF-DMA, MeOH, 55 °C, 16 h; (d) NaBH4, MeOH, rt, 2 h; (e) H2, 20% Pd(OH)2, MeOH, rt, overnight; (f) 4-Chlorobutyryl chloride, TEA, DCM, rt, 2 h; (g) 18, TEA, KI, acetonitrile, 90 °C, 24 h.
