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ChemInform Abstract: Heterodiene Cycloadditions: Synthesis and Oxidation of Pyrano(3,2-b) indoles into Spiro Derivatives.

✍ Scribed by J.-Y. MEROUR; A. MAMAI; B. MALAPEL; P. GADONNEIX

Publisher
John Wiley and Sons
Year
2010
Weight
38 KB
Volume
28
Category
Article
ISSN
0931-7597

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Synthesis of 5H-Pyrazino(2,3-b)indoles from Indole-2,3-dione Derivatives. -The reaction of the N-acetylisatins (I) with ethylenediamine yields the products (III). After dehydrogenation these compounds and their analogues (IV) after deacetylation are cyclized by heating to the title products (VI). N