Abstract
Ergot alkaloids and their synthetic analogs have been reported to exhibit broad biological activity. The author investigated direct construction of the C/D ring system of ergot alkaloids based on palladium-catalyzed domino cyclization of amino allenes. With this biscyclization as the key step, total synthesis of (±)-lysergic acid, (±)-lysergol and (±)-isolysergol was achieved.
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Notes
- 1.
The relative configuration of 16a was determined by NOE analyses of the corresponding pyran, obtained by Au-catalyzed stereospecific cyclization [28].
- 2.
The relative configurations of 20a and 20b were confirmed by their conversion to isolysergol and lysergol, respectively.
- 3.
The relative configurations of 21a were confirmed by derivatization of 20a to the same compound.
- 4.
Cleavage of nosyl group in the ester derived from 20 was less effective (20–30% yield) under standard conditions.
- 5.
The relative configuration of 23a was confirmed by conversion to 21a [31].
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Inuki, S. (2012). Palladium-Catalyzed Domino Cyclization of Amino Allenes Bearing a Bromoindolyl Group and Its Application to Total Synthesis of Ergot Alkaloids. In: Total Synthesis of Bioactive Natural Products by Palladium-Catalyzed Domino Cyclization of Allenes and Related Compounds. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54043-4_4
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