1: (S)-6,6'-dibromo-2,2'-dihydroxy-1,1'-binaphthyl With n-butyllithium in tetrahydrofuran; hexane T=-78 - -70°C; 5 h; Inert atmosphere; 2: methyl iodide in tetrahydrofuran; hexane T=-50°C; 0.75 h; Inert atmosphere; 3: With hydrogenchloride in tetrahydrofuran; hexane; water T=20°C; pH=< 1; Cooling with ice;

hydrogenchloride; iron(III) chloride

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