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Heterocycles from ylides. Part IV. Reactivity of 4-arylmethylene-?2-pyrazolin-5-ones with stabilized sulphur ylides

✍ Scribed by Croce, Piero Dalla; Pocar, Donato

Book ID: 118038170
Publisher: Royal Society of Chemistry
Year: 1976
Weight: 207 KB
Volume: 6
Category: Article
ISSN: 1472-7781
DOI: 10.1039/p19760000620

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## Abstract 4‐(Dicyanomethylene)‐3‐methyl‐1‐phenyl‐2‐pyrazoline‐5‐one (1) readily reacts with α‐amino acids and their esters by Michael addition and subsequent elimination of HCN to the adducts 2a–k. One of these, 2i (obtained from methyl glycinate), adds stereoselectively to __N__‐phenylmaleimide