Synthesis of some pyridine and dihydropyridine derivatives from 7-hydroxy-8-methoxy-2-oxo-2H-1-benzopyran-6-carboxaldehyde
β Scribed by Hoda I. El-Diwani
- Book ID
- 112961151
- Publisher
- Springer
- Year
- 1995
- Tongue
- English
- Weight
- 261 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0253-6269
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract Condensation of 3βformyl chromone **1** with hydroxylamine hydrochloride afforded the corresponding oxime **2** that was converted to nitrile **3**. Refluxing of oxime **2** and/or nitrile **3** with aceturic or hippuric acid gave **16** and **17**. Treatment of **1** with semicarbazide
I211 Genbve 4 (5. V .86) ~ Comparative results on the reduction of 4,6,7,8-tetrahydro-7,7-dimethyl-2H-1 -benzopyran-2,5(3H)-diones 1 are reported. Hydride reduction (LiAIH, in EtzO or NaBH, in i-PrOH) affords 2,3,4,6,7,8-hexahydro-5H-l-benzopyran-5-ones 5 in 30-60 % isolated yield. Photochemical red