[CH3:1][C:2]([CH3:13])([O:4][C:5]([NH:7][C@H:8]([C:10]([OH:12])=O)[CH3:9])=[O:6])[CH3:3].Cl.[CH3:15][C:16](=[CH2:19])[CH2:17][NH2:18].O.ON1C2C=CC=CC=2N=N1.CN1CCOCC1>O1CCCC1>[CH3:9][C@H:8]([NH:7][C:5](=[O:6])[O:4][C:2]([CH3:1])([CH3:3])[CH3:13])[C:10]([NH:18][CH2:17][C:16]([CH3:19])=[CH2:15])=[O:12]
To a cooled (0° C.) mixture of 18.9 parts of (S)-N-[(1,1-dimethylethoxy)carbonyl]alanine, 10.8 parts of 2-methyl-2-propen-1-amine monohydrochloride, 27.0 parts of 1-hydroxy-1H-benzotriazole hydrate and tetrahydrofuran, there were added 10.1 parts of N-methylmorpholine and, after 20 min, 20.6 parts of N,N-methanetetraylbis[cyclohexanamine] under a nitrogen atmosphere. The whole was kept at 0° C. for 1 hour and at room temperature for 12 hours. The solvent was evaporated and the residue was partitioned between dichloromethane and NaHCO3 (sat.). The organic layer was separated, washed with NaCl (sat.), dried, filtered and evaporated, yielding 24.2 parts (99.9%) of (1,1-dimethylethyl) (S)-[1-methyl-2-[(2-methyl-2-propenyl)amino]-2-oxoethyl]carbamate (interm. 63).
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