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Stereoselective cycloadditions of (1Z,4R∗,5R∗)-1-arylmethylidene-4-benzoylamino-5-phenylpyrazolidin-3-on-1-azomethine imines to maleimides

✍ Scribed by Lidija Pezdirc; Janez Cerkovnik; Samo Pirc; Branko Stanovnik; Jurij Svete


Book ID
118501441
Publisher
Elsevier Science
Year
2007
Tongue
French
Weight
363 KB
Volume
63
Category
Article
ISSN
0040-4020

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The 5,5-dimethylpyrazolidin-3-one (4), prepared from ethyl 3-methylbut-2-enoate (3) and hydrazine hydrate, was treated with various substituted benzaldehydes 5a ± i to give the corresponding (1Z)-1-(arylmethylidene)-5,5-dimethyl-3-oxopyrazolidin-1-ium-2-ide azomethine imines 6a ± i. The 1,3-dipolar