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Issue 19, 2000
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Synthesis, structure and comparative stability of β-hydrazono, oximino methyl ether and iminoboronates

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Abstract

β-Hydrazono and oximino ether boronates have been prepared by the sequential lithiation of the corresponding methyl hydrazone or oxime methyl ether, followed by reaction with an iodomethylboronate ester, typically in the form of the pinacol ester. The resulting products have contrasting hydrolytic stabilities. β-Hydrazono boronates are highly sensitive to intramolecularly catalysed hydrolysis, providing the corresponding β-keto boronates in generally high yields; β-oximino ether boronates are stable to silica gel chromatography and show evidence of EZ-isomerisation. Stable homochiral boronate ester derivatives of β-oximino ethers can be readily prepared by a double transesterification process, via a diethanolamine-mediated pinacol ester exchange, followed by diethanolamine ester hydrolysis–reesterification process with a homochiral diol. β-Imino boronates can be generated in situ by condensation of the corresponding β-keto boronate with a primary amine, however the resulting imine function is highly hydrolytically unstable and cannot be isolated in a pure form.

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Publication details

The article was received on 07 Jun 2000, accepted on 04 Aug 2000 and first published on 18 Sep 2000


Article type: Paper
DOI: 10.1039/B004573J
J. Chem. Soc., Perkin Trans. 1, 2000, 3250-3263

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    Synthesis, structure and comparative stability of β-hydrazono, oximino methyl ether and imino boronates

    R. J. Mears, H. E. Sailes, J. P. Watts and A. Whiting, J. Chem. Soc., Perkin Trans. 1, 2000, 3250
    DOI: 10.1039/B004573J

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