Br[C:2]1[CH:14]=[CH:13][C:5]2[S:6][C:7]3[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=3[C:4]=2[CH:3]=1.[C:15]1(B(O)O)[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.C(=O)([O-])[O-].[K+].[K+].C(O)C>C1(C)C=CC=CC=1.O>[C:15]1([C:2]2[CH:14]=[CH:13][C:5]3[S:6][C:7]4[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=4[C:4]=3[CH:3]=2)[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1
2-bromo-dibenzo[b,d]thiophene (10 g), phenylboronic acid (5.1 g) tetrakis(triphenylphosphine)palladium (2.2 g) and potassium carbonate (18.38 g) were refluxed in a mixture of toluene (110 mL), ethanol (20 mL) and water (90 mL) overnight. The reaction was quenched with water and the toluene layer was removed and passed through a celite column and the toluene layer was evaporated in a rotary evaporator to yield 5.2 g 2-phenyl-dibenzo[b,d]thiophene. 2-phenyldibenzo[b,d]thiophene (5.2 g) was dissolved in anhydrous tetrahydrofuran (50 mL) under nitrogen atmosphere, and the solution was then cooled to −78° C. 20.0 mL of n-butyl lithium (1.6 M solution) was added dropwise into the reaction mixture, and continuously stirred to equilibriate to room temperature. The reaction mixture was then cool to −60° C., and trimethyborate (5.67 mL) was added and the reaction was allowed to stir overnight. The reaction was then quenched with 20% aqueous hydrochloric acid, and extracted the organic layer with ethyl acetate; ethyl acetate layer was then washed thoroughly with water and dried over anhydrous sodium sulfate, and was evaporated to dryness to yield 4.2 g of 8-phenyldibenzo[b,d]thiophene-4-boronic acid.
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