1: (-)-quinine With thionyl chloride; triethylamine in tetrahydrofuran T=-78°C; 0.5 h; 2: p-tolyldiethylaluminum in tetrahydrofuran T=-78°C; 2 h; 3: methyl-magnesium chloride in tetrahydrofuran T=0°C; 0.5 h; Product distribution / selectivity;