Scheme 3. Synthetic scheme to prepare the naphthofuran triazole–acetamide hybrids 20(a–j)via conventional and CTAB-catalyzed protocol: (A) conventional protocol: K₂CO₃, DMF, 95 °C; (B) CTAB-catalyzed protocol (improved protocol): CTAB, K₂CO₃, KI, DMF, ultrasound, 80 °C.