Acetonitrile → 2-Amino-3-(5-(5-phenylthiophen-2-yl)-1H-indol-3-yl)propanoic acid

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2-Amino-3-(5-bromo-1H-indol-3-yl)-propionic acid (0.020 g, 0.071 mmol) was added to a 5 ml microwave vial, which contained 5-phenyl-thiophen-2-boronic acid (0.016 g, 0.078 mmol), Na2CO3 (0.015 g, 0.142 mmol), acetonitrile (1.5 ml)/water (1.5 ml) and dichlorobis(triphenylphosphine)-palladium (3 mg, 0.003 mmol). Microwave vial was capped and stirred at 150° C. for 5 min under microwave radiation. Reaction mixture was cooled, filtered through a syringe filter and then separated by a reverse phase preparative-HPLC using YMC-Pack ODS 100×30 mm ID column (MeOH/H2O/TFA solvent system). The pure fractions were concentrated in vacuum. The product was then suspended in 5 ml of water, frozen and lyophilized to give 5 mg of pure product, 2-amino-3-[5-(5-phenyl-thiophen-2-yl)-1H-indol-3-yl]-propionic acid. 1H-NMR (300 MHz, CD3OD): 3.21-3.26 (m, 2H), 4.25 (q, 1H), 7.15-7.35 (m, 8H), 7.58 (d, 2H), 7.82 (d, 1H).

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