Reaction of 4-phenylbut-3-en-2-one with cyanoacetamide in 2:1 ratio
O'Callaghan, C. N., McMurry, T. B. H., Cardin, C. J. and Wilcock, D. J. (1993) Reaction of 4-phenylbut-3-en-2-one with cyanoacetamide in 2:1 ratio. Journal of the Chemical Society, Perkin Transactions 1 (20). pp. 2479-2486. ISSN 0300-922X
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To link to this article DOI: 10.1039/P19930002479
The reaction of 4-phenylbut-3-en-2-one with cyanoacetamide is not confined to a 1 : 1 reaction [which results in formation of 3-cyano-6-methyl-4-phenylpyridin-2(1H)-one]. The reaction of 2 mole equivalents of 4-phenylbut-3-en-2-one with one of cyanoacetamide also takes place, the products being 1-cyano-6-hydroxy-6-methyl-4-methylene-8,9-diphenyl-3-azabicyclo[3.3.1]nonan-2-one and 3-cyano-6-methyl-3-(3-oxo-1-phenylbutyl)-4-phenyl-3,4-dihydropyridin-2(1H)-one. The latter compound cyclises in acid medium to form 6-acetyl-4-cyano-1-methyl-5,8-diphenyl-2-azabicyclo[2.2.2]octan-3-one. X-Ray crystal structures of the 3-azabicyclo[3.3.1]nonan-2-one and the 3-azabicyclo[2.2.2]octan-2-one derivatives are described.