Selective partial reduction of various heteroaromatic compounds with bridgehead nitrogen via birch reduction protocol

Joseph T. Kim, Vladimir Gevorgyan

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

(Chemical Equation Presented) For the first time various heteroaromatic compounds with bridgehead nitrogen, including indolizines, bispyrrolopyrimidines, pyrroloquinolines, pyrroloisoquinolines, and bispyrrolopyrazines, were selectively partially reduced under Birch reduction conditions. It was found that the double bond in the fused heterocycles which possesses the highest LUMO density can be selectively reduced under these conditions. Indolizine 6, containing an ester group at C-6, was reductively alkylated to give dihydroindolizines 8 and 9 possessing a quaternary carbon center in good yield. It was found that ambident substrate 12, under Birch reduction conditions, underwent smooth partial reduction to give 4,5-dihydroquinoline 14 as a sole product with no evidence of reduction of the side chain olefin. It was also shown that electron-rich pyrroloisoquinoline 15, which cannot be reduced via catalytic hydrogenation conditions, was efficiently transformed into its dihydrocounterpart 16 by using the Birch reduction protocol. Finally, it was shown that various fused diazines were smoothly and stereoselectively reduced under Birch reduction conditions to give trans-4,5-disubstituted dihydropyrimidines 30 and 32 in virtually quantitative yields.

Original languageEnglish (US)
Pages (from-to)2054-2059
Number of pages6
JournalJournal of Organic Chemistry
Volume70
Issue number6
DOIs
StatePublished - Mar 18 2005
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry

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