Abstract
An efficient catalyst-free and diastereoselective synthesis of novel dihydropyrano[2,3-d]pyrimidine and dihydropyrano[3,2-c]chromen-annulated benzosultams is described. A number of (E)-N-(2-formylphenyl)-N-methyl-2-phenylethenesulfonamides were synthesized and underwent a one-pot domino Knoevenagel hetero-Diels–Alder reaction, respectively, with N,N-dimethylbarbituric acid and 4-hydroxycoumarin in water, giving the desired products, in moderate to excellent yields.
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