Direct synthesis of pyrazolo[5,1-a]isoindoles via intramolecular palladium-catalyzed C-H bond activation

Young Lok Choi, Hyuk Lee, Bum Tae Kim, Kihang Choi, Jung Nyoung Heo

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27 Citations (Scopus)


An efficient, direct synthesis of pyrazolo-[5,1-a]isoindoles employing a palladium-catalyzed intramolecular C-H bond activation of 1-(2-halobenzyl) pyrazoles has been developed. The use of lithium chloride (LiCl) was found to be essential in these reactions, to suppress further C-H bond activation at the C-3 position of pyrazolo[5,1-a]isoindole, when C-3 is unsubstituted. This protocol can be applied to the synthesis of a pyrazolo[5,1-a]isoquinoline possessing a six-membered central ring system and a fully substituted pyrazolo[5,1-a]isoindole using sequential intra- and intermolecular C-H bond activation.

Original languageEnglish
Pages (from-to)2041-2049
Number of pages9
JournalAdvanced Synthesis and Catalysis
Issue number11-12
Publication statusPublished - 2010 Sep 13



  • C-H activation
  • Direct arylation
  • Palladium
  • Pyrazoles

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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