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Synthetic route of target compounds 19a-l and 20a-l. Reagents and conditions: (a) POCl3, DMF, Dichloromethane, Potassium acetate; (b) NaH (60%), DMF, 1-Bromo-3-chloropropane or 1-Bromo-2-chloroethane; (c) DMF, Amine,130 °C, 5 h; (d) 8a or 8b, DMSO, Conc. H2SO4 (Cat.), 70 °C, 5 h.
