Preparation of 1,3-Disubstituted-5- cyano-4,5-dihydropyrazoles via 1,3-Dipolar Cycloaddition of Nitrile Imine with Acrylonitrile
β Scribed by Li-Ping Song; Shi-Zheng Zhu; Ji-Ling Huang
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 382 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0256-7660
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## Abstract magnified image 1,3βDipolar cycloadditions of azomethine imines **3a** and **3b**, available by acidβcatalyzed treatment of 3βpyrazolidinone **1** with acetone (**2a**) and butyraldehyde (**2b**), respectively, were studied. Reactions of **3a** with DMAD (**4**) afforded a mixture of p
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