TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The weak base is potassium carbonate or sodium carbonate. The inert atmosphere is argon atmosphere or nitrogen atmosphere. The weak alkaline aqueous solution is potassium carbonate, potassium phosphate or sodium carbonate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Compound (I) reacting a brominated ester of formula (III) with boric acid in the presence of a catalyst, solvent and weak base in an inert atmosphere for Suzuki esterification reaction at 60-100 (preferably 80) degrees C for 10-24 (preferably 12) hours. Compound (II) is prepared by subjecting a brominated compound of formula Br-Ar' (IV) to Suzuki coupling reaction in the presence of catalyst, weak alkaline aqueous solution (0.5-3, preferably 2 mol/l), solvent A and inert atmosphere at 70-120 (preferably 110) degrees C for 10-24 (preferably 20) hours. Compound (VI) is prepared by subjecting a brominated compound of formula Br-Ar'-Br in the presence of catalyst, weak base aqueous solution (0.5-3, preferably 2 mol/l) and inert atmosphere at 80-130 (preferably 110) degrees C for 36-78 (preferably 72) hours; adding phase transfer catalyst; adding with bromobenzene or 2-thiophene to the product; and subjecting to Suzuki coupling reaction in the presence of solvent A at 80-130 (preferably 110) degrees C for 5-10 (preferably 6) hours. Preferred Components: The catalyst is 1,1'-(bis(diphenyl phosphorus)ferrocene)palladium chloride or triphenyl phosphine palladium. The weak base is potassium acetate. The solvent is 1,4-dioxane, tetrahydrofuran and/or N,N-dimethyl formamide. The ratio of brominated ester, boric acid, catalyst and weak base is 0.3-0.8:0.04-0.08:0.03-0.06:1 (preferably 0.6:0.07:0.04:1). The weak alkaline aqueous solution is potassium acetate or sodium acetate. The ratio of catalyst, weak alkaline aqueous solution, compound (IV) and solvent A is 0.05-0.1:0.05-0.09:1.5-2.5:1 (preferably 0.06:0.07:1.19:1). The solvent A is toluene, tetrahydrofuran or N,N-dimethyl formamide. The compound (IV) is of formula (V). The Br-Ar'-Br is of formula (VII). The phase transfer catalyst is methyl octyl ammonium chloride. The ratio of catalyst, weak base aqueous solution, compound (VII) and phase transfer catalyst is 0.05-0.1:0.05-0.09:0.001-0.01:0.8-1.6:1 (preferably 0.06:0.07:0.005:1.1:1). The mass ratio of product, bromobenzene or 2-thiophene and solvent is 0.002-0.05:0.002-0.05:1 (preferably 0.004:0.004:1).