(S)-tert-Butyl (1-amino-3-phenylpropan-2-yl)carbamate → Di-tert-butyl ((2R,2'S)-azanediylbis(1-phenylpropane-3,2-diyl))dicarbamate

Participants

Reaction Conditions

Reaction Steps

The product from Example 1B (0.54 g, 2.16 mmol) and the product from Example 1C (0.50 g, 2.14 mmol) in isopropanol (5 mL) were placed in a sealed tube and heated at 100° C. for 18 hours. The mixture was concentrated and the residue was purified by column chromatography on silica gel (24:1 CHCl3:methanol) to provide the title compound as a colorless solid (0.44 g, 42%). Rf=0.55 (CHCl3:methanol, 9:1); 1H NMR (CDCl3) δ 7.30-7.14 (m, 10H), 4.61 (br s, 2H), 3.87 (m, 2H), 2.87-2.77 (m, 2H), 2.72 (dd, J=7.4, 13.6 Hz, 2H), 2.57 (d, J=5.8 Hz, 4H), 1.41 (s, 18H); MS (APCl+) m/z 484 (M+H)+.

Provenance & Evidence