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 …