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Synthesis, tautomerism and stereochemistry of spiropyrazolines

✍ Scribed by Gábor Tóth; Albert Lévai; Helmut Duddeck

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
328 KB
Volume
30
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

1,3‐Dipolar cycloaddition of (E)‐ and (Z)‐arylidene‐1‐tetralone derivatives affords trans‐ and cis‐spiro‐1‐pyrazolines, respectively, regio‐ and stereo‐selectively in a one‐step reaction. These rearrange into spiro‐2‐pyrazolines on proton catalysis. The relative configurations and conformations of the spiropyrazolines were elucidated by different NMR methods.

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