Published February 28, 2004
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Biginelli reaction on 4-oxo-4H-1-benzopyran-3-carboxaldehyde- a search for reaction pathway
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Department of Chemistry, R. K. Mission Vivekananda Centenary College, Rahara, Kolkata-700 118, India
E-mail: kantachandra@rediffmail.com
Manuscript recevied 31 January 2003, revised 6 May 2003. accepted 22 August 2003
On heating a mixture of 3-formylchromone 1, active methylene compound 2 or 3 and urea (4) in AcOH produces dihydropyrimidinones 10 or 11, whereas use of thiourea in place of urea produces 1,3-thiazine derivative 14 or 15 and the above reactions pass through the Knoevenagel condensate 5 or 6.
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