A Stereodivergent Strategy for Total Syntheses of Antirhine Alkaloids

E Park, C Bae, CG Cho, CH Cheon - The Journal of Organic …, 2021 - ACS Publications
E Park, C Bae, CG Cho, CH Cheon
The Journal of Organic Chemistry, 2021ACS Publications
Total syntheses of the antirhine alkaloids are described. The cyanide-catalyzed imino-Stetter
reaction of the aldimine derived from ethyl 2-aminocinnamate and 4-bromopyridine-2-
carboxaldehyde provided a 2-pyridinyl substituted indole-3-acetate, which was further
converted into the corresponding indoloquinolizidinium intermediate through C-ring
formation. Subsequent trans-selective installation of the homoallylic alcohol side-chain at C-
15 in the resulting indoloquinolizidinium allowed the total syntheses of antirhine and its …
Total syntheses of the antirhine alkaloids are described. The cyanide-catalyzed imino-Stetter reaction of the aldimine derived from ethyl 2-aminocinnamate and 4-bromopyridine-2-carboxaldehyde provided a 2-pyridinyl substituted indole-3-acetate, which was further converted into the corresponding indoloquinolizidinium intermediate through C-ring formation. Subsequent trans-selective installation of the homoallylic alcohol side-chain at C-15 in the resulting indoloquinolizidinium allowed the total syntheses of antirhine and its known epimer.
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