4-Dimethylamino boronic acid (0.221 g, 1.34 mmol), tetrabutylammonium bromide (TBAB) (0.049 g, 1.25 mmol), palladium acetate (Pd(OAc)2 (0.017 g, 0.08 mmol), triorthotoluene phosphine (P(o-toluene)3 (0.035 g, 0.12 mmol), and 6-(6-bromo-1,2,3,4-tetrahydro-carbazol-9-yl)-hexanoic acid ethyl ester (compound 4) (0.300 g, 0.76 mmol) were added to a flask, dissolved in toluene (3 mL), ethanol (2 mL), and 2M Na2CO3 (1 mL), and stirred overnight at 70° C. Compound 32 was purified by column chromatography to give 310 mg of the product as a solid.
