Synthesis of thiophene-based TAK-779 analogues by C-H arylation

Anna Junker, Junichiro Yamaguchi, Kenichiro Itami*, Bernhard Wünsch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


A rapid synthesis of thiophene-based TAK-779 analogues 1 is reported using a late-stage diversification strategy. At the end of the synthesis, the key building block 2, which was prepared in six steps from thiophene, was arylated regioselectively at the α-position directly with iodoarenes. Since 2 offers several reactive positions, various established catalyst systems were tested. It was found that Crabtree catalyst (an Ir catalyst) converted efficiently and selectively the thiophene system 2 into 2-aryl-substituted compounds 9. The direct C-H arylation of 2 with electron-rich iodoarenes led to high yields, whereas electron-deficient iodoarenes required longer reaction times for complete conversion. A small set of diverse amides 1 was synthesized by hydrolysis of 9 and subsequent HATU coupling with primary amines 4.

Original languageEnglish
Pages (from-to)5579-5586
Number of pages8
JournalJournal of Organic Chemistry
Issue number11
Publication statusPublished - 2013 Jun 7
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry


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