反应详情

5-Amino-2-(3(R)-(t-butoxycarbonyl)aminopyrrolidin-1-yl)fluorobenzene (27.33 g, 0.093 M) was dissolved in dry pyridine (150 ml) and cooled under nitrogen with stirring to 0°. Ethyl chloroformate (11.01, 0.102 M) was added dropwise, and the mixture stirred 30 minutes at the same temperature. Ice-water (250 ml) was added, and stirring continued for 1 hour. The resulting precipitate was collected, washed thoroughly with water, and dried, to give the desired product of sufficient quality for use without purification (33.6 g). NMR (DMSO-d6) δ: 1.21 (t, 3H); 1.36 (s, 9H); 1.90 (m, 1H); 2.05 (m, 1H); 3.04 (m, 1H); 3.20 (m, 1H); 3.32 (m, 1H); 3.40 (m, 1H); 4.02 (br, 1H); 4.05 (q, 2H); 6.62 (t, 1H); 7.02 (d, 1H); 7.08 (d, 1H); 7.22 (d, 1H); 9.38 (br, 1H). MS (ESP): 368 (MH+) for C18H26FN3O4

1. temperaturecooled under nitrogen
2. stirringthe mixture stirred 30 minutes at the same temperature
3. stirringstirring
4. customThe resulting precipitate was collected
5. washwashed thoroughly with water
6. customdried