Reaction of 1-Benzylindole-2,3-dicarboxylic Anhydride with 3-Bromo-4-lithiopyridine: Formal Synthesis of Ellipticine
摘要:
Reaction of 1-benzylindole-2,3-dicarboxylic anhydride with 3-bromo-4-lithiopyridine gave 2-(3-bromoisonicotinoyl)indole-3-carboxylic acid as the sole product. The indole-3-carboxylic acid could be converted to 6-benzylellipticine quinone in five steps.
selenoesters under hexabutylditin−hν conditions undergo regioselective intramolecular reaction with unprotonated pyridines to give polycyclic indolylpyridyl ketones. For substrates bearing a (3-pyridyl)methyl moiety connected to the 3-position of the indole ring, the cyclization provides easy access to ellipticine quinones.