Tang Chao-Jun, Babjak Matej, Anderson Regan J, Greene Andrew E, Kanazawa Alice
Chimie Recherche (LEDSS), Université Joseph Fourier, 38041 Grenoble, France.
Org Biomol Chem. 2006 Oct 21;4(20):3757-9. doi: 10.1039/b611202a. Epub 2006 Sep 18.
Enantiopure 20(S)-camptothecin has been prepared from a known hydroxypyridone through a novel approach that involves a Claisen rearrangement, an asymmetric nucleophilic ethylation, a Heck coupling and a Friedländer condensation as the key transformations.