| abstract |
A process for the preparation of a compound of the formula (I) (I) in which X is an optionally protected formyl group and R is a group which is itself inert to the reaction conditions of the synthesis and selected from the following groups (groups), which comprises reacting a compound of the formula (II) (II) where X is as defined above, with a substituted phenyl-halogen compound of the formula (III) (III) where the substituent Hal is a halogen group and R is as defined above in the presence of a transitional metal catalyst palladium at a temperature range of 20℃ to 150℃ and a pressure range of 1 bar to 5 bar. |