1-Bromo-3-(1,1-dimethoxyethyl)-5-(pentafluorosulfanyl)benzene (200 mg) was initially charged at RT in DME (30 ml) under argon. Two drops of water were added to the DME. A strong argon stream was used to displace the oxygen from the solution for 45 min. Then pyrrolidine (45 μl) was added dropwise through a septum, followed by (+)-2,2′-bis(diphenylphosphino)-1,1′-binaphthalene (5 mg), sodium tert-butoxide (73 mg) and palladium(II) acetate (1.2 mg). The reaction mixture was heated to 85° C. for 3 h. Then EA was added to the reaction mixture and, after removing the EA phase, the aqueous phase was extracted three times with EA. The combined EA phases were dried over magnesium sulfate, filtered and concentrated. The residue was dissolved in ACN/water and adjusted to pH 2 with 1N hydrochloric acid. After standing for 30 min, the mixture was concentrated and the residue was purified by means of preparative HPLC. The product-containing fractions were combined, freed of the acetonitrile, admixed with saturated sodium hydrogencarbonate solution and extracted three times with ethyl acetate. The combined extracts were dried over magnesium sulfate, filtered and concentrated. 55 mg of the desired compound were obtained.
