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0 °C

A mixture made up of 5 g (17.47 mmol) of N-(4-bromobenzyl)-L-valine and 5.9 g (70.24 mmol) of sodium bicarbonate in 50 mL of dry THF is left under stirring and under nitrogen atmosphere for one hour. The preceding suspension is cooled to 0° C. and to it is added over a period of 15 min. 4.2 mL (35.41 mmol) of valeroyl chloride. The mixture is then left to react at 20-25° C. for 3 h, 50 mL of water is added and the THF is distilled at low pressure. The resulting solution is taken to pH 2 with HCl 35% and the remains of THF distilled off completely. The solid obtained is filtered, washed with 50 mL of water and dried in a vacuum over to provide 5.9 g (91.2%) of N-(4-bromobenzyl)-N-valeryl-L-valine. The solid is recrystallised from a mixture of EtOH/H2O 2:1. M.p.=123° C.

1. waitis left
2. additionis added over a period of 15 min
3. waitThe mixture is then left
4. customto react at 20-25° C. for 3 h
5. distillationthe THF is distilled at low pressure
6. distillationthe remains of THF distilled off completely
7. customThe solid obtained
8. filtrationis filtered
9. washwashed with 50 mL of water
10. customdried in a vacuum over