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Crystal structure of [2]benzopyrano[3,4-b]quinoxalin-5-one through spontaneous air oxidation rearrangement of 6-Chloro-isoindolo[2,1-a]quinoxaline

✍ Scribed by Stéphane Moreau; Vanessa Desplat; Solène Savrimoutou; Stéphane Massip; Gérard Déléris; Jean Guillon


Book ID
119222796
Publisher
Elsevier Science
Year
2012
Tongue
English
Weight
400 KB
Volume
15
Category
Article
ISSN
1631-0748

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## Abstract magnified image Derivatives of the hitherto unknown ring system, pyrazolo[4′,3′:5,6]pyrano[2,3‐__b__]quinoxalin‐4(1__H__)‐one, are synthesized in one step from the corresponding 1‐substuituted or 1,3‐disubstituted 2‐pyrazolin‐5‐ones and 3‐chloroquinoxaline‐2‐carbonyl chloride using cal

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## Abstract On treatment with lead tetraacetate (Pb(OAc)~4~), the 1‐(alkylidene)‐1,2,3,4‐tetrahydro‐__N__‐(trichloroacetyl)isoquinolines **2a**–**2c** as well as the tribromoacetyl derivative **4** undergo an oxidative cyclization with concomitant migration of the trihalogenomethyl group to afford