Patent ID: 7692027

Claim:
A process for the preparation of a compound of formula (I) or a salt thereof comprising the reaction of a compound of formula (II) or a salt thereof with a synthon of formula (III) or a salt thereof in the presence of a catalyst, an organic ligand and, if necessary, a basic agent; wherein W is a COOH group, or a W'group which can be transformed into a COOH group; one of X and Z is a leaving group, while the other one is a group of formula —B(OR 1 OR 2 ) wherein R 1 and R 2 are independently hydrogen, C 1 -C 8 alkyl, aryl, aryl-C 1 -C 8 alkyl or R 1 and R 2 , taken together, form a —(CH 2 ) m —V—(CH 2 ) n group, wherein m and n, which can be the same or different, are 0 or 1, and V is NR 3 or C(R 3 ) 2 wherein each R 3 is independently hydrogen, C 1 -C 8 alkyl, aryl or aryl- C 1 -C 8 alkyl; a lithium or copper atom or a halogenated metal; and, if necessary, the conversion of the W'group to a —COOH group and/or, if desired, the conversion of a compound of formula (I) to a salt and/or, if desired, the conversion of a salt of a compound of formula (I) to its unsalified form.