1988
DOI: 10.1002/ardp.19883211211
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Indoles, VII 4,9‐Dihydropyrano[3,4‐b]indol‐1(3H)‐ones from meta‐substituted α‐Phenylhydrazono‐δ‐lactones ‐ Synthesis and Regioselectivity

Abstract: Indoles 885Indoles, VII 4,PDihydropyrano[ 3,4-b]indol-1( 3H)-ones from meta-substituted a-Phenylhydrazono-&lactones -The indolization of 3a-f, available by reaction of 1 with the diazonium salts 2a-f, produces mixtures of position isomers. Significant influences on the ratio 4/5 by electronic or steric effects of the chosen substituents cannot be recognized. Indolization of 6 also gives a mixture -10 and 11 -, on the other hand 9 yields pure 12. Indole, 7. Mitt.: 4,9-Dihydropyrano[3,4-blindol-1(3H)-one aus met… Show more

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