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Modified Coumarins. I. Synthesis of 5-Phenyl-7H-furo[2, 3-g]chromen-7-ones and 9-Phenyl-7H-furo-[2, 3-f]chromen-7-ones

✍ Scribed by M. M. Garazd; Ya. L. Garazd; S. V. Shilin; V. P. Khilya

Book ID
111527827
Publisher
Springer
Year
2000
Tongue
English
Weight
62 KB
Volume
36
Category
Article
ISSN
0009-3130

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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