dimethylsulfide borane complex in tetrahydrofuran T=0 - 60°C;

1.1: oxalyl dichloride / N,N-dimethyl-formamide / dichloromethane / 48 h / 20 °C / Inert atmosphere 2.1: ammonium hydroxide / ethyl acetate / 0.5 h 3.1: dimethylsulfide borane complex / tetrahydrofuran / 136 h / 0 - 60 °C 3.2: 4 h / 50 °C / pH 2 3.3: pH 10 View Scheme

1.1: ammonium hydroxide / ethyl acetate / 0.5 h 2.1: dimethylsulfide borane complex / tetrahydrofuran / 136 h / 0 - 60 °C 2.2: 4 h / 50 °C / pH 2 2.3: pH 10 View Scheme