CARBAMIC ACID, N-[(1R,3R)-3-AMINOCYCLOPENTYL]-, 1,1-DIMETHYLETHYL ESTER, REL-

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of ((1R,3R)-3-allyloxycarbonylamino-cyclopentyl)-carbamic acid tert-butyl ester (890 mg, 3.13 mmol), 1,3-dimethylbarbituric acid (1.47 g, 9.39 mmol) and Pd(PPh3)4 (181 mg, 0.15 mmol) in DCM (30 mL) was stirred at ambient temperature for 90 minutes. The reaction mixture was concentrated under vacuum and purified by column chromatography on silica gel (gradient: 2M NH3 in methanol solution in DCM) to afford 350 mg (56%) ((1R,3R)-3-amino-cyclopentyl)-carbamic acid tert-butyl ester. LCMS (Method H, ESI): RT=0.36 min, m+H=200.9; 1H NMR (400 MHz, DMSO) δ: 6.77 (s, 1H), 3.90 (m, 1H), 3.31 (m, 1H), 1.87 (m, 2H), 1.54 (m, 2H), 1.37 (s, 10H), 1.18 (m, 1H). The reaction mixture was concentrated under vacuum purified by column chromatography on silica gel (gradient: 2M NH3 in methanol solution in DCM)