反应详情

CDI (10.2 g, 0.063 mol) was added to a solution of 3-oxo-cyclobutanecarboxylic acid (6 g, 0.052 mol) in THF (60 ml) at 0° C. under stirring, the mixture was stirred at RT for 1 h. Benzylamine (6.9 ml, 0.063 mol) was added to the mixture and the mixture was stirred at RT for 3 h and evaporated. The residue was purified by chromatography (silica gel, 63-100 μm, 300 g, CHCl3/MeOH 100:0→95:5) to give the title compound (9.5 g, 89%) as white crystals. LC/MS data: 204.0, 205.1 (M+H) (calculated for C12H13NO2 203.24). 1H NMR data (DMSO-d6): 8.62 (br.s, 1H, NH); 7.21-7.36 (m, 5H, Ph); 4.32 (d, 2H, CH2, J=6.1 Hz); 3.10-3.28 (m, 5H).

1. stirringthe mixture was stirred at RT for 1 h
2. stirringthe mixture was stirred at RT for 3 h
3. customevaporated
4. customThe residue was purified by chromatography (silica gel, 63-100 μm, 300 g, CHCl3/MeOH 100:0→95:5)