3b-d. Alternatively, 3c and 3d were prepared in excellent yield by condensation of 2- cyanotetrahydropyridines 2c and 2d with indole in acetic acid medium. Deethyldaeycarpidone was obtained from 3b in poor or moderate yields by three alternative procedures and from 3c in a three-step sequence. The preparation of deethyldasycarpidone from 2-cyanotetrahydropyridine 2c via the (tetrahydropyridy1) indole 3c constitutes an ...
