1: 20.25 h; Heating / reflux; 2: With hydrogenchloride in methanol; water Heating / reflux; 3: With dipotassium hydrogenphosphate; formic acid; dihydrogen peroxide; potassium formiate; acetic anhydride; methanesulfonyl chloride; triethylamine; trichloroacetonitrile more than 3 stages;

1: 20 h; Heating / reflux; 2: With hydrogenchloride in methanol; water

in methanol 23.5 h; Heating / reflux;

Heating / reflux;