Synthesis of (±)-17-Methylcamptothecins
(±)-17-Methylcamptothecins (29) were synthesized from the heteroyohimbane ajmalicine (5) through sequential oxidation steps and E-ring functionalization. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)