Experimental and theoretical study of the spectroscopic properties and the preparation of 3-benzyl-2H-pyrano[3,2-c]chromene-2,5(6H)-dione
✍ Scribed by Moghaddam, Firouz Matloubi; Foroushani, Behzad Koushki
- Book ID
- 121262298
- Publisher
- Elsevier Science
- Year
- 2014
- Tongue
- English
- Weight
- 839 KB
- Volume
- 1065-1066
- Category
- Article
- ISSN
- 0022-2860
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## Abstract The key 3-(2-oxo-2H-chromen-3-yl)-2-oxo-2H,5H-pyrano[3,2-c]chromen-5-yl acetates 3 were synthesized in high yields by cyclocondensation of 4-oxo-4H-chromen-3-carbaldehydes 1 with coumarin-3-acetic acids 2 under mild conditions. The reaction pathway involves aldol condensation and subseq
The \(o\)-hydroxyformylcoumarin \(5 \mathrm{~b}\), easily prepared from compound 1 , is further transformed to the title coumarin derivatives \(7,10,19 a-c\) via its initial Wittig olefination with ylides \(2 b, 8,18 a-c\) respectively. Coumarins \(16 \mathrm{a}, \mathrm{b}\) were also formed by tre