摘要:
We describe efficient synthetic routes to murrayamine A (mukoenine C), O-methylmurrayamine A, mahanine, O-methylmahanine, and murrayamine D and the first total syntheses of murrayamine E, I, and R.. Key steps are a palladium-catalyzed construction of the carbazole framework and an: annulation of the pyran ring, which is either catalyzed by phenylboronic acid or promoted by a Lewis acid.