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7.82 g (34 mmol) of tert-butyl (2S,4R)-2-(aminocarbonyl)-4-hydroxypyrrolidine-1-carboxylate was dissolved in 80 ml of pyridine and 12 ml (84 mmol) of trifluoroacetic anhydride was added to the solution dropwise, at −20 C□. The mixture was stirred at room temperature for a day. The excess of anhydride was hydrolised by addition of some drops of water. To this mixture 200 ml of ethyl acetate was added and it was washed with 10% aqueous hydrogen chloride (to pH 3-5), 50 ml 2 N solution of sodium hydroxide and 50 ml brine. The organic solution was dried over sodium sulphate and evaporated to result in an oil. Yield: 5.35 g (74%). (MH30)=213, (MH+)2=426.

1. washit was washed with 10% aqueous hydrogen chloride (to pH 3-5), 50 ml 2 N solution of sodium hydroxide and 50 ml brine
2. dry with materialThe organic solution was dried over sodium sulphate
3. customevaporated
4. customto result in an oil