Abstract
Yamaguchi esterification of (2Z,5S,6E)-5-(hydroxymethyl)-2,6-dimethyl-7-(2-methyl-1,3-thiazol-4-yl)hepta-2,6-dienal with (2R,5R,6S,7S)-2-(methoxymethoxy)-3,3,5,7-tetramethyl-4-oxo-9-[(1-phenyl-1H-tetrazol-5-yl)sulfonyl-6-[(triethylsilyl)oxy]nonanoic acid afforded the expected acyclic ester. Acid- and base-catalyzed Z,E-isomerization in the 2-methyl enal fragment of acyclic precursors was revealed.
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ACKNOWLEDGMENTS
The spectral studies were performed using the facilities of the Chemistry joint center (Ufa Institute of Chemistry, Ufa Federal Research Center, Russian Academy of Sciences).
Funding
This study was performed in the framework of state assignment (project nos. AAAA-A17-117011910032-4, AAAA-A20-120012090021-4).
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Valeev, R.F., Sunagatullina, G.R. & Miftakhov, M.S. Synthesis and Isomerization of the 2-Methyl Enal Fragment of Acyclic Precursors to 9,11-Diene Analogs of Epothilones. Russ J Org Chem 56, 1140–1145 (2020). https://doi.org/10.1134/S1070428020070039
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DOI: https://doi.org/10.1134/S1070428020070039