volume 55, issue 3, P718-727 1990
DOI: 10.1135/cccc19900718
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Abstract: Substituted 2-amino-4-(5-X-2-furyl)-4H-pyrans IIIa-IIIe have been prepared by a cyclization reaction of 5-X-2-furylmethylenepropanedinitriles IIa-IIe with 2,4-pentanedione. In reaction of 3-(5-X-2-furyl)-methylene-2,4-pentanediones Ia-Ie with propanedinitrile the formation of 4H-pyrans IIIa-IIIe is accompanied, depending on the catalyst type, by the formation of 5-X-2-furylmethylenepropanedinitriles IIa-IIe. 2-(4-Methylbenzylideneamino)-4H-pyran (V), 2-formylamino-4H-pyran (VI), and 3H, 5H-pyrano[2,3-d]pyrimid…

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