| abstract |
The invention concerns a process for the production of an epothilone of formula 9 <CHEM> wherein (i) an epothilone of formula 2a (scheme II) is converted into compound of formula 3a (scheme II), (ii) the compound of formula 3a is reacted with a compound of formula 6 (which has been formed by reacting a compound of formula 4 with a compound of formula 5; scheme II) to give a compound of formula 7 (scheme II), (iii)the compound of formula 7 is reacted in the presence of a Grubbs catalyst to give a compound of formula 8a (scheme II), (iv) the compound of formula 8a is converted into a compound of formula 8b (scheme II), and (v) compound of formula 8b is converted to a compound of formula 9 (scheme II). <??>Finally, the invention concerns compounds which are obtainable according to the process. <IMAGE> |