## Abstract For Abstract see ChemInform Abstract in Full Text.
Synthesis of 3-thienyl substituted 2-pyrazolines by 1,3-dipolar cycloaddition
โ Scribed by M. M. Krayushkin; M. A. Kalik; S. A. Voznesensky
- Book ID
- 112387368
- Publisher
- Springer
- Year
- 1994
- Tongue
- English
- Weight
- 320 KB
- Volume
- 43
- Category
- Article
- ISSN
- 1573-9171
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๐ SIMILAR VOLUMES
## Abstract Novel 2โpyrazolines were obtained by the cycloaddition of diazomethane to bis(arylsulfonylethenyl)โsulfones (**3**) and 1โarylsulfonylโ2โstyrylsulfonylethenes (7). Dehydrogenation of 2โpyrazolines with chloranil gave pyrazoles.
Thiazolium ylids 2a and 2b are converted to 4 in 3 steps. Summary: The 1,3-dipolar cycloaddition of azomethine ylids with activated alkenes constitutes an effective synthetic method for certain pyrrolidines. 1 However, the reaction is rather limited in that R and R' are invariably aryl substituents