Ethyl isocyanatoacetate → Methyl (2S)-ethyloxycarbonylmethylaminocarbonylamino-3-tert-butoxycarbonylaminopropionate

Participants

Reaction Steps

5.13 ml (45.8 mmol) of ethyl isocyanatoacetate are added dropwise to a suspension of 10 g (45.8 mmol) of the compound (3.3) in 100 ml of tetrahydrofuran and the mixture is left to stir at room temperature for 3 h; the solvent is removed in vacuo and the residue is chromatographed through silica gel using ethyl acetate/methanol =20/1. 13.44 g (85%) of (3.4) are obtained as a pale yellow oil.

Provenance & Evidence