Patent ID: 7619123

Claim:
A method for preparing compound (2) from compound (5) having the formula: which comprises: (a) admixing 3,4-difluoroanisole (5) with anhydrous magnesium chloride in an inert organic solvent; (b) cooling the admixture from step (a) to about −78° C.; (c) adding n-BuLi to the admixture in step (b) maintaining the temperature at about <−75° C.; (d) adding N, N-dimethylformamide to the admixture in step (c) at about −78° C. maintaining the temperature at about <−75° C.; (e) warming the admixture in step (d) to about 0° C. and then quenching the admixture with an aqueous acidic solution; and (f) separating the organic solution from the aqueous solution in step (e) to provide compound (2) in the organic solution.