Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 80, Issue 4, Pages 2240-2248Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo502753s
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Funding
- SusChemSys
- European Research Council
- Deutsche Forschungsgemeinschaft (DFG)
- European Regional Development Fund (ERDF)
- state of North Rhine-Westphalia, Germany under Operational Programme Regional Competitiveness and Employment
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A small series of S- and N-heterocyclic 1,2-bis(trimethylsilylethynyl)arenes (2, 9, and 12) react with the strongly electrophilic borane B(C6F5)(3) in consecutive 1,1-carboboration sequences to benzannulated heterocyclic systems. With this approach, highly substituted carbazole (6), benzothiophene (10), and quinoline (14) derivatives can be synthesized. While benzannulation occurs in all three cases, the reactions are quite different in detail. Finally, one-pot deborylation reactions lead to hydroxy-hetarenes, as demonstrated for the hydroxy-carbazole 7 and the hydroxy-benzothiophene 11.
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