38486-11-2Relevant academic research and scientific papers
Synthesis and reactivity of 4-hydroxy-5-methyl-2-(2-oxo-2H-chromen-3-yl)-6H-1,3-oxazin-6-ones
Chernov,Filippova,Yakovlev,Zakhs,Belyakov
, p. 1292 - 1299 (2016)
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 residu
Organic compound containing Schiff base unit and preparation method and application thereof (by machine translation)
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Paragraph 0034; 0073-0074; 0080-0082, (2020/07/02)
The invention provides an organic compound containing Schiff base units and a preparation method and application thereof, wherein 5 - bromosalicylaldehyde is reacted with hydrazine hydrate to obtain compound I; and compound I, benzaldehyde, inorganic base
Synthesis of 2-Amino-4-(3-amino-5-hydroxy-4 H -pyrazol-4-ylidene)-4 H -chromene-3-carbonitriles
Mane, Mansing M.,Pore, Dattaprasad M.
supporting information, p. 1720 - 1724 (2016/07/06)
A simple and efficient protocol was developed for the synthesis of 2-amino-4-(3-amino-5-hydroxy-4H-pyrazol-4-ylidene)-4H-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 2-cyanoacetohydrazide instead of malononitrile, the unexpected formation of a salicylaldehyde azine was observed, leading to a novel route for the synthesis of salicylaldehyde azines.
Novel de-acylative ring opening of 3-acetyl and 3-bromo acetyl coumarins
Yaragatti, Naazneen B.,Kulkarni, Manohar V.,Kumar, Gudibande N. A.,Gururow, Tayur N.
, p. 594 - 597,4 (2020/09/15)
Reaction of 3-acetyl and 3-bromoacetyl coumarins with hydrazine hydrate has resulted in the ring opening of the coumarin moiety. The reaction was attempted with a view to obtain some new pyridazinones and pyrazolones. The reaction did not proceed via the expected pathway instead led to the formation of salicyl azines, the structure of which has been confirmed by single crystal X-ray studies.
