Taxane Synthesis through Intramolecular Pinacol Coupling at C-1−C-2. Construction and Oxidative Transformations of a C-Aromatic Taxane Diene
A ten-linear-step construction of C-aromatic taxane diene 14 from ethyl isopropyl ketone, acryloyl chloride, and commercially available 8 is reported. This sequence concludes with an intramolecular pinacol coupling carried out on 13. 14 is oxidized by m-chloroperbenzoic acid and dimethyldioxirane to...
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Veröffentlicht in: | Journal of organic chemistry 1996-02, Vol.61 (3), p.1101-1108 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A ten-linear-step construction of C-aromatic taxane diene 14 from ethyl isopropyl ketone, acryloyl chloride, and commercially available 8 is reported. This sequence concludes with an intramolecular pinacol coupling carried out on 13. 14 is oxidized by m-chloroperbenzoic acid and dimethyldioxirane to give 17 through intermediate epoxide 20 and by VO(acac)2−t-BuOOH and Mo(CO)6−t-BuOOH to give 13. 17 is converted efficiently into 22 upon treatment with Mo(CO)6−t-BuOOH, apparently through an unusual equilibration with isomeric 20, which is converted irreversibly to 22. While these oxidative transformations highlight some of the peculiar reactivity patterns characteristic of taxane-related structures, the formation of 14 through an intramolecular pinacol coupling that joins C-1 and C-2 demonstrates the potential of this strategy for stereoselectively delivering advanced taxane synthesis intermediates. |
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ISSN: | 0022-3263 1520-6904 |
DOI: | 10.1021/jo951935e |