## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The reactions of 4-dicyanomethylene-2-phenyl-4H-1-benzopyran and some benzologs with nucleophiles
β Scribed by G. A. Reynolds; J. A. Vanallan; C. C. Petropoulos
- Book ID
- 112122264
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1970
- Tongue
- English
- Weight
- 650 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0022-152X
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π SIMILAR VOLUMES
## Abstract magnified image The title aldehyde **1** reacts smoothly with the enamine moiety of **2**βaminochromone **2** to produce hitherto unreported 3β(2βhydroxybenzoyl)β5__H__β1βbenzopyrano[2,3β__b__]pyridinβ5βone (azaxanthone) **5**. This reaction has been extended for the synthesis of bisaz
O-Acetates of 4-hydroxy and 4-hydroxy-7-methoxy-2H-1,4-benzoxazln-3-ones reacted with nucleophlles such as phenols, lndoles and ethanethlol The maJor reaction center IS the positively-charged nitrogen atom
Reaction of 3,2, 6, benzopyran with either organolithium reagents or magnesium generates the novel strained alkyne, 3,4-didehydro-2H-[1]benzopyran. Cycloaddition with furans gives access to the dibenzo[b,d]pyran system.