in benzene T=45 - 65°C;

sodium hydroxide; dihydrogen peroxide 1.) CH2Cl2, rt, 5 h; 2.) ether;

1: 1.) lithium bis(trimethylsilyl)amide / 1) THF, -78 deg C, 20 min; 2) THF, rt, overnight 2: tetrahydrofuran / 0.5 h / 0 °C 3: 24 percent / SmI2 / tetrahydrofuran; hexamethylphosphoric acid triamide; methanol / 0.25 h / -78 °C View Scheme

1: tetrahydrofuran / 0.5 h / 0 °C 2: 24 percent / SmI2 / tetrahydrofuran; hexamethylphosphoric acid triamide; methanol / 0.25 h / -78 °C View Scheme