1: With oxalyl dichloride; dimethyl sulfoxide in dichloromethane T=-78°C; 0.5 h; 2: With triethylamine in dichloromethane

[(dppf)Pt(H2O)2](OTf)2; hydrogen; sodium lauryl sulfate in water T=70°C; P=60006 Torr; 22 h; Autoclave;

1.1: 1H-imidazole / dichloromethane / 0 - 20 °C 2.1: dimethyl sulfoxide; oxalyl dichloride / dichloromethane / 0.5 h / -78 °C 3.1: n-butyllithium / tetrahydrofuran; hexane / 2.5 h / -78 - 20 °C 3.2: 18 h / -78 - 20 °C 4.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / 20 °C 5.1: dimethyl sulfoxide; oxalyl dichloride / dichloromethane / 0.5 h / -78 °C View Scheme

1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / 20 °C 2: dimethyl sulfoxide; oxalyl dichloride / dichloromethane / 0.5 h / -78 °C View Scheme