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Synthesis of 4-Aryl-3-(2-chromonyl)-2-pyrazolines by the 1,3-dipolar cycloaddition of 2-styrylchromones with diazomethane

✍ Scribed by Diana C. G. A. Pinto; Artur M. S. Silva; Lúcia M. P. M. Almeida; José A. S. Cavaleiro; Albert Lévai; Tamás Patonay


Publisher
Journal of Heterocyclic Chemistry
Year
1998
Tongue
English
Weight
685 KB
Volume
35
Category
Article
ISSN
0022-152X

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2-Pyrazolines from 1,3 - dipolar cycload
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## Abstract Novel 2‐pyrazolines were obtained by the cycloaddition of diazomethane to bis(arylsulfonylethenyl)‐sulfones (**3**) and 1‐arylsulfonyl‐2‐styrylsulfonylethenes (7). Dehydrogenation of 2‐pyrazolines with chloranil gave pyrazoles.

Synthesis of spiro-1-pyrazolines by the
✍ Artur M. S. Silva; José A. S. Cavaleiro; Albert Lévai; Tamás Patonay 📂 Article 📅 1999 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 641 KB

## Abstract 1,3‐Dipolar cycloadditions of exocyclic α,β‐unsaturated ketones 1‐22 with diazomethane afforded spiro‐1‐pyrazolines 23‐44 in a diastereospecific reaction. The structure and stereochemistry of each compound synthesised has been elucidated by nmr spectroscopic measurements and other analy