Preparation of 2,3-Dihydroquinazolin-4(1H)-one Derivatives in Aqueous Media with β-Cyclodextrin-SO3H as a Recyclable Catalyst.

A novel methodology for the synthesis of title compounds such as (III), (V), (IX), and (X) by ring closure of 2-aminobenzamides (I) with aldehydes (II) or ketones (IV) is described.