Structural and synthetic insights into pyridine homocouplings mediated by a β-diketiminato magnesium amide complex

Eva Hevia, Ross McLellan, Laia Davin, William Clegg, Alan Kennedy, Michael R Probert

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Reaction of [(DippNacnac)Mg(TMP)] (1) with 4‐subtituted pyridines proceeds via sequential regioselective metalation and 1,2‐addition to furnish a range of symmetric 4,4'R2‐2,2'‐bipyridines in good yield, representing a new entry into bipyridine synthesis. Interestingly, the reaction with of 1 with 2‐OMe‐pyridine led to formation of asymmetric bipyridine 6, resulting from the C6‐magnesiation of the heterocycle followed by a C‐C coupling step by addition to the C2 position of a second, non‐metallated molecule, and subsequent elimination of [DippNacnacMgOMe]2 (7). Synthesis combined with spectroscopic and structural analysis help rationalise the underlying processes resulting in the observed reactivity, and elucidates the key role of the sterically encumbered β‐diketiminate ligand plays in determining regioselectivity.
Original languageEnglish
Number of pages7
JournalChemistry - A European Journal
Early online date27 Jul 2018
DOIs
Publication statusE-pub ahead of print - 27 Jul 2018

Keywords

  • bipyridine synthesis
  • B-diketiminate ligand
  • spetroscopic and structural analysis

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