Patent ID: 7700784

Claim:
A process for the manufacture of the compound of formula (I) wherein Y represents a tetrazole protecting group, and R 1 and R 2 , independently of one another, represent C 1 -C 10 -alkyl, or R 1 and R 2 combined together form C 2 -C 10 -alkylene; comprising reacting an aryl magnesium halide compound of formula (II b) wherein Hal is chlorine, bromine or iodine, in the presence of a transition metal catalyst and a catalytically effective amount of a metal salt additive, with a compound of formula (II c) wherein X is a substituent which, when bound to a phenyl ring, is not considerably replaceable at room temperature by an aryl magnesium halide reagent of formula (II b) in the absence of a catalyst; and, if necessary, isolating a resulting compound of formula (I).