INTERMEDIATES IN PHARMACEUTICAL CAMPTOTHECIN PREPARATION
摘要
The present invention relates to a method for preparing intermediates useful in the preparation of camptothecin and camptothecin-like compounds and to the intermediates used in this preparation. In particular, the invention provides a process for the preparation of a compound of formula II' <CHEM> wherein X is halogen, which comprises reacting a compound of formula III <CHEM> with a compound of formula IX' <CHEM>
