Synthesis of Fischer indole derivatives using carboxyl-functionalized ionic liquid as an efficient and recyclable catalyst
2009; Elsevier BV; Volume: 20; Issue: 3 Linguagem: Inglês
10.1016/j.cclet.2008.11.010
ISSN1878-5964
AutoresYi Feng, Hai Sun, Xian Hua Pan, Yuan Xu, Ji Zong Li,
Tópico(s)Oxidative Organic Chemistry Reactions
ResumoFischer indole cyclization of phenylhydrazine and various ketones using carboxyl-functionalized ionic liquid, 1-carboxymethyl-3-methylimidazolium tetrafluoroborate (abbreviated as [cmmim][BF4]) as catalyst was successfully performed. The yields of the target compounds were 80–92%, the purities were 96–98%. The catalyst could be recovered and reused for at least six times without significant loss in activity.
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