New and practical synthesis of 1,4-dihydrobenzopyrano-pyrazoles
✍ Scribed by S Chandrasekhar; G Rajaiah; P Srihari
- Book ID
- 104231384
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- French
- Weight
- 69 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
A new method for the synthesis of 1,4-dihydrobenzopyranopyrazoles using bromovinyl hydrazones has been described involving a [3+2] intramolecular cycloaddition.
📜 SIMILAR VOLUMES
The facile and convenient access by a conventional procedure in ethanol as solvent to a new series of succinyl-spaced pyrazoles including 1,4-bis[5-(trichloromethyl)-5-hydroxy-4,5-dihydro-1H-pyrazol-1yl]butane-1,4-diones (64-82%) and the respective dehydrated derivatives as 1,4-bis[5-(trichloromethy
## Abstract magnified image A regiospecific cyclization‐dehydration reaction of a 1‐[(4‐(__N__‐alkyl‐__N__‐(__tert__‐butyloxycarbony)amino)‐phenyl]‐4,4,4‐trifluorobutane‐1,3‐done with a 4‐aminosulfonyl‐, or 4‐methylsulfonyl‐, phenylhydrazine hydrochloride in refluxing ethanol proceeded with simult