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N-Hydroxy-propionamidine (0.10 g, 1.15 mmol) in DMF (2 ml) is added to a stirred suspension of sodium hydride (0.05 g of a 60% dispersion in oil, 1.26 mmol) in DMF (20 ml) in the presence of molecular sieves (0.1 g). The reaction flask is then immersed in a pre-heated oil bath at 50° C. and stirring continued for 5 min. 3-tert-Butoxycarbonylamino-propionic acid ethyl ester (0.25 g, 1.15 mmol) in DMF (2 ml) is added over 5 minutes. After 3 hours at 50° C. the mixture is cooled to 0° C. and water (3 ml) is added. The mixture is allowed to warm to room temperature then filtered through Celite™ filter material, washing with ethyl acetate, and the solvent is removed. Purification by chromatography, eluting with hexane:ethyl acetate (3:1) affords the titled compound.

1. customThe reaction flask is then immersed in a pre-heated oil bath at 50° C.
2. temperatureto warm to room temperature
3. filtrationthen filtered through Celite™
4. filtrationfilter material
5. washwashing with ethyl acetate
6. customthe solvent is removed
7. customPurification by chromatography
8. washeluting with hexane:ethyl acetate (3:1)