104248-19-3Relevant academic research and scientific papers
Benzopyrans: Part XIX - Reactions of 3-Acetyl- and 3-Acetyl-2-methyl-4-oxo-4H-benzopyrans with Nitrogen Nucleophiles
Ghosh, Chandra Kanta,Pal, Chandana,Bhattacharyya, Atanu
, p. 914 - 917 (2007/10/02)
3-Acetyl-4-oxo-4H-benzopyran (1a) gives with piperidine the enaminoketone (2); with phenylhydrazine a mixture of the pyrazoles (5a and 7a, R'=Ph); and with hydroxylamine the nitrile (12) and isoxazole (13a) under two different conditions.Like 1a, the chromenone (1b) also behaves as a Michael acceptor towards hydrazine and hydroxylamine to produce the pyrazoles (7b, R'=H, Ph) and isoxazole (13b), respectively.Guanidine forms the pyrimidine (17a) with 1a, but 18b with 1b.
