1: With methanesulfonyl chloride in N,N-dimethyl-formamide T=75°C; 1 h; 2: With sodium hydroxide in water; N,N-dimethyl-formamide T=5 - 20°C; pH=7; 3 h;

peracetic acid in acetic acid; ethyl acetate T=20°C; 72 h;

1: 54 percent / tetramethylammonium bromide; methanesulfonic anhydride / dimethylformamide / 4 h / 0 - 23 °C 2: 94 percent / peracetic acid / ethyl acetate; acetic acid / 72 h / 20 °C View Scheme

1: With p-toluenesulfonyl chloride in pyridine T=25°C; 12 h; 2: With ethanolamine in pyridine T=25°C; 1 h;