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An efficient Et 3 N/DMAP-assisted approach has been reported for the synthesis of indenopyrimidine sulfonamides from indenopyrimidine-2-amines  via  S-N bond formation. The various indenopyrimidine-2-amines were synthesized from crotonic acid, corresponding aldehydes and guanidinium hydrochloride using one-pot three-component strategy. The treatment of indenopyrimidine-2-amines with various sulfonyl chlorides in the presence of Et 3 N/DMAP in  N -methylpyrrolidinone afforded the corresponding sulfonamides in good to excellent yields. All newly synthesized compounds were characterized by  1 H NMR,  13 C NMR and mass spectral studies.

Synthesis of Novel Indenopyrimidine Sulfonamides from Indenopyrimidine-2-Amines via S–N Bond Formation