Amir Samiei, Mohammad Ali Bodaghifard, M. Hamidinasab
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Green and Convenient Synthesis of Pharmaceutically Active Mono and
Bis-dihydroquinazolines via a One-pot Multicomponent Reaction Under
Sulfamic Acid Catalysis
Multicomponent reactions (MCRs) and green chemistry are essential criteria for
the development of efficient chemical syntheses for valuable organic compounds.
The design, synthesis, and development of sustainable procedures for the production of novel
biological and pharmaceutical molecules have gained high importance. Herein, an environmentally benign
synthesis of mono- and bis-2,3-dihydroquinazolin-4(1H)-ones as pharmaceutically active compounds
was carried out in good to high yields of 80-99% within 45-120 minutes.
The desired products were synthesized via three-component and pseudo five-component condensations
of isatoic anhydride, a primary amine (aniline or ammonium acetate), and an aldehyde/dialdehyde
using sulfamic acid (20%) as a solid acidic catalyst under the solvent-free condition at 100°C.
The easy work-up procedure, metal-free and environmentally benign catalyst, green reaction
conditions for performing MCRs, and high yields of pure products are some advantages of the presented
protocol.