Cellulose-SO3H as a biodegradable solid acid catalyzed one-pot three-component Ugi reaction: Synthesis of α-amino amide, 3,4-dihydroquinoxalin-2-amine, 4H-benzo[b][1,4]thiazin-2-amine and 1,6-dihydropyrazine-2,3-dicarbonitrile derivatives

► Cellulose-SO3H as a biodegradable solid acid catalyst. ► Synthesis of organic compounds using green reaction mediums. ► Water acts as the internal nucleophile for the synthesis α-amino amides. ► Synthesis of quinoxalin, thiazin and pyrazine derivatives.