1: 1-benzyl-tetrahydro-thiophenium tetrafluoroborate With lithium hexamethyldisilazane in tetrahydrofuran; dichloromethane T=-78°C; 1 h; 2: B-iPr-9-BBN in tetrahydrofuran; dichloromethane T=-100 - 0°C; 3: With sodium hydroxide; dihydrogen peroxide in tetrahydrofuran; dichloromethane T=0 - 20°C; Further stages.;

2,6-di-tert-butyl-phenol

1: (1S,3S,4R)-2-benzyl-3-[(1S,4R)-7,7-dimethyl-2-oxobicyclo[2.2.1]hept-1-yl]-2-thioniabicyclo[2.2.1]heptane tetrafluoroborate With lithium hexamethyldisilazane in tetrahydrofuran; dichloromethane T=-78°C; 1 h; 2: B-iPr-9-BBN in tetrahydrofuran; dichloromethane T=-100 - 0°C; 3: With sodium hydroxide; dihydrogen peroxide in tetrahydrofuran; dichloromethane T=0 - 20°C; Further stages.;

1: Br2 / CH2Cl2 2: Br2 3: 24 h / Ambient temperature 4: (oxidation) View Scheme