## 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
✦ LIBER ✦
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 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