1: With methanesulfonic acid in acetonitrile T=20 - 45°C; 1 h; 2: With sodium carbonate in isopropanol acetate; water T=5 - 20°C; pH=8.5; Product distribution / selectivity;

thionyl chloride in acetonitrile T=0 - 20°C; 24.5 h; Product distribution / selectivity;