Abstract
Enantioselective total synthesis of the biologically important indole alkaloids, (+)-lysergol, (+)-isolysergol and (+)-lysergic acid is described. Key features of these total synthesis include: (1) a facile synthesis of a chiral 1,3-amino alcohol via the Pd(0) and In(I)-mediated reductive coupling reaction between l-serine-derived 2-ethynylaziridine and formaldehyde; (2) the Cr(II)/Ni(0)-mediated Nozaki−Hiyama−Kishi (NHK) reaction of an indole-3-acetaldehyde with iodoalkyne; and (3) Pd(0)-catalyzed domino cyclization of an amino allene bearing a bromoindolyl group. This domino cyclization enabled direct construction of the C/D ring system of the ergot alkaloids skeleton as well as the creation of the C5 stereogenic center with transfer of the allenic axial chirality to the central chirality.
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Notes
- 1.
The author planned to develop a new synthetic route to the chiral amino allenes 5 because the synthetic route described in Chap. 4 gave the racemic amino allenes of the type 5 in low diastereoselectivities.
- 2.
The relative configuration of 12 was determined by 1H NOE analysis.
- 3.
The relative configuration of allenic amide 5a was confirmed by comparison with the authentic sample (±)-5a prepared from the known allenic amide (±)-22a, which, in turn, was obtained through an Au-catalyzed Claisen rearrangement of the corresponding propargyl vinyl ether (see Chap. 4).
- 4.
The relative configuration of 4a was confirmed by comparison with the authentic sample prepared from the known compound (±)-23a (see Chap. 4).
- 5.
The author cannot rule out other factors for rationalization of the observed selectivities. For example, the reactive conformer as depicted in F might have better orbital alignment for anti-addition of the amine nucleophile to the allenic moiety activated by Pd(II) than in epi-F, thus leading to a selective formation of the desired product 4a.
- 6.
The reproducibility of the oxidation reaction was significantly dependent on the purity of the Dess-Martin reagent.
- 7.
Separation of the diastereomer at this step is important for the preparation of lysergic acid (1) in high ee, because the transformation of 25 to 1 accompanying isomerization relies on the chirality at C-5.
- 8.
The optical purity of lysergic acid was confirmed by derivatization to methyl isolysergate 25a and lysergate 25b and their chiral HPLC analyses.
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Inuki, S. (2012). Total Synthesis of (+)-Lysergic Acid, (+)-Lysergol, and (+)-Isolysergol. 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_5
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