Synthesis of 2-Amino-4-(3-amino-5-hydroxy-4H-pyrazol-4-ylidene)-4H-chromene-3-carbonitriles
作者:Dattaprasad Pore、Mansing Mane
DOI:10.1055/s-0035-1561952
日期:——
A simple and efficient protocol was developed for the synthesis of 2-amino-4-(3-amino-5-hydroxy-4 H -pyrazol-4-ylidene)-4 H -chromene-3-carbonitriles by the potassium phosphate-catalyzed reaction of salicylaldehydes, malononitrile, and 2-cyanoacetohydrazide in ethanol. The method offers advantages such as a simple workup procedure and good yields. When the method was extended to two equivalents of
Synthesis and reactivity of 4-hydroxy-5-methyl-2-(2-oxo-2H-chromen-3-yl)-6H-1,3-oxazin-6-ones
作者:N. M. Chernov、P. V. Filippova、I. P. Yakovlev、V. E. Zakhs、A. V. Belyakov
DOI:10.1134/s1070363216060128
日期:2016.6
4-Hydroxy-6H-1,3-oxazin-6-ones with a coumarin fragment in position 2 of the oxazine ring were synthesized. Their hydrolysis, alcoholysis, and hydrazinolysis afforded a number of new coumarin derivatives containing malonamic acid and 1,2,4-triazole residues. The low stability of the title compounds toward oxygencentered nucleophiles was interpreted by quantum chemical calculations.
Torrey; Brewster, Journal of the American Chemical Society, 1913, vol. 35, p. 432