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2,6‐Diaryl‐4,4‐disubstituted‐4H‐thiopyran: Source for spiro heterocycles |
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| Authors: | Venkatapuram Padmavathi Akula Balaiah Dandu Bhaskar Reddy |
| Abstract: | The 1,5‐diaryl‐3,3‐disubstituted‐1,5‐pentanedione on reaction with ammonium acetate, phosphorus pentoxide and phosphorus pentasulfide gave respective 1,4‐dihydropyridine, 4H‐pyran and 4H‐thiopyran. Novel spiro heterocycles have been obtained by the cyclocondensation of 4H‐thiopyran with hydrazine, hydroxylamine, urea and thiourea. |
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