A Stereodivergent Strategy for Total Syntheses of Antirhine Alkaloids
Eunjoon Park1, Cheolwoo Bae1, Cheon-Gyu Cho2
1Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul02841, Republic of Korea.
Abstract:
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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