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Evidence and isolation of tetrahedral intermediates formed upon the addition of lithium carbenoids to Weinreb amides and N-acylpyrroles

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Abstract

The tetrahedral intermediates generated upon the addition of halolithium carbenoids (LiCH2X and LiCHXY) to Weinreb amides have been intercepted and fully characterized as O-TMS heminals. The commercially available N-trimethylsilyl imidazole is the ideal trapping agent whose employment, combined with a straightforward neutral Alox chromatographic purification, enables the isolation of such labile species. The procedure could be advantageously extended also for obtaining O-TMS heminals from N-acylpyrroles. These intermediates manifest interesting reactivity including as precursors of more complex carbenoids.

Graphical abstract: Evidence and isolation of tetrahedral intermediates formed upon the addition of lithium carbenoids to Weinreb amides and N-acylpyrroles

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Publication details

The article was received on 06 Jul 2017, accepted on 31 Jul 2017 and first published on 01 Aug 2017


Article type: Communication
DOI: 10.1039/C7CC05215D
Citation: Chem. Commun., 2017, Advance Article
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    Evidence and isolation of tetrahedral intermediates formed upon the addition of lithium carbenoids to Weinreb amides and N-acylpyrroles

    L. Castoldi, W. Holzer, T. Langer and V. Pace, Chem. Commun., 2017, Advance Article , DOI: 10.1039/C7CC05215D

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