Triethylamine → 4-(4-{[(S)-2-(4-methanesulfonyl-phenyl)-1-methylethyl]propylamino}butyl)-3-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester

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A mixture of propyl-[(S)-2-(4-methanesulfonylphenyl)-1-methylethyl]-amine hydrochoride (0.50 g, 1.7 mmole), 3-oxo-4-(4-oxobutyl)-[1,4]diazepane-1-carboxylic acid tert-butyl ester (0.5 g, 1.76 mmole), triethylamine (0.24 mL, 1.7 mmole), and sodium triacetoxyborohydride (0.54 g, 2.6 mmole) in 1,2-dichloroethane (20 mL) was stirred at room temperature for 17 hours. The solvent was removed, and the residue was partitioned between ethyl acetate (30 mL) and 5% sodium carbonate (20 mL). The organic phase was dried (magnesium sulfate) and concentrated to give 4-(4-{[(S)-2-(4-methanesulfonyl-phenyl)-1-methylethyl]propylamino}butyl)-3-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester, (0.89 g), as a syrup. Nmr (chloroform-d) δ (ppm): 0.82, t, 3H; 0.94, d, 3H; 1.46, s, 9H; 3.05, s, 3H; 7.36, d, 2H; 7.83, d, 2H.

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