1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 1-(tert-butoxycarbonyl)-4-[[N-(3-(trifluoromethyl)benzoyl)glycyl]aminomethyl]piperidine

Temperature

25 °C

N-{3-(Trifluoromethyl)benzoyl}glycine (4.22 g, 17.0 mmol), EDCI (4.25 g, 22.1 mmol), 1-hydroxybenzotriazole hydrate (2.99 g, 22.1 mmol) and Et3N (1.72 g) were added to a solution of 1-(tert-butoxycarbonyl)-4-(aminomethyl)piperidine (4.03 g) in dry CH2Cl2 (200 mL). The reaction mixture was stirred at 25° C. for 20 h. H2O (100 mL) was added to the reaction mixture and the mixture was extracted with CH2Cl2(2×50 mL). The combined extracts were washed with H2O (2×50 mL), brine (50 mL) and dried (MgSO4). The solvent was removed under reduced pressure to afford an yellow oil which was purified by column chromatography (SiO2, 70% EtOAc-hexane) to give 1-(tert-butoxycarbonyl)-4-[{N-(3-(trifluoromethyl)benzoyl)glycyl}aminomethyl]piperidine as a white solid (6.39 g, 85%): 1H-NMR (CDCl3, 300 MHz) δ1.4 (s, 9 H), 1.0-1.8 (m, 5 H), 2.6-2.8 (m, 2 H), 3.15-3.3 (m, 2 H), 4.0-4.3 (m, 4 H), 6.6-6.7 (m, 1H), 7.64 (s, 1 H), 7.60 (dd, 1 H, J=7.2, 7,2 Hz), 7.79 (d, 1 H, J=7,2 Hz), 8.0 (d, 1 H, J=7.2 Hz), 8.11 (s, 1 H); The purity was determined by RPLC/MS (97%); ESI/MS m/e 444.3 (M++H, C21H28F3N3O4).

1. extractionthe mixture was extracted with CH2Cl2(2×50 mL)
2. washThe combined extracts were washed with H2O (2×50 mL), brine (50 mL)
3. dry with materialdried (MgSO4)
4. customThe solvent was removed under reduced pressure
5. customto afford an yellow oil which
6. customwas purified by column chromatography (SiO2, 70% EtOAc-hexane)

ORD record

ord-00b208724ae9434aba2b16d1411fc619

Source dataset

uspto-grants-2002_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06451842B1