1: 3-bromo-trifluoroacetanilide With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2 h; Sealed tubeInert atmosphere; 2: tri-isopropoxy-borane in tetrahydrofuran; hexane T=-78 - 20°C; 1 h; Sealed tubeInert atmosphere; 3: hydrogenchloride in tetrahydrofuran; hexane; water Sealed tube;