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4H,8H-Pyrano[2,3-f]chromene-4,8-diones as versatile precursors for the synthesis of 6-(1,2-oxazol-5-yl)-2H-chromene-2-ones

โœ Scribed by Oleg A. Lozinski, Tatyana V. Shokol, Vladimir P. Khilya


Book ID
118789163
Publisher
Springer Vienna
Year
2012
Tongue
English
Weight
386 KB
Volume
144
Category
Article
ISSN
0026-9247

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## Abstract magnified image Anhydrous zinc bromide catalysed reactions of arylidineโ€3โ€acetyl coumarins (**1aโ€c**) and 5,6โ€benzoanalogs of arylidine 3โ€acetyl coumarins (**4a,4b**) with 1,3โ€cyclohexanedione gives โ€(4โ€arylโ€5โ€oxoโ€5,6,7,8โ€tetrahydroโ€4__H__โ€chromenโ€2yl)โ€2__H__โ€chromenโ€2โ€ones (**3a, 3c**