Carbon tetrabromide → HCID 86673576, compound

Reaction equation

O[C@@H:2]1[CH2:22][N:5]2[C:6](=[O:21])[N:7]([C:9]3[CH:14]=[CH:13][C:12]([O:15][CH2:16][C:17]([F:20])([F:19])[F:18])=[CH:11][CH:10]=3)[CH2:8][C@H:4]2[CH2:3]1.C(Br)(Br)(Br)[Br:24].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>C(#N)C>[Br:24][C@H:2]1[CH2:22][N:5]2[C:6](=[O:21])[N:7]([C:9]3[CH:14]=[CH:13][C:12]([O:15][CH2:16][C:17]([F:20])([F:19])[F:18])=[CH:11][CH:10]=3)[CH2:8][C@H:4]2[CH2:3]1

Participants

Procedure

To a solution of (6S,7aR)-6-Hydroxy-2-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-hexahydro-pyrrolo[1,2-c]imidazol-3-one (example 33, step f) (900 mg, 2.848 mmol) in acetonitrile (10 ml) was added CBr4 (2.24 g, 8.544 mmol) at room temperature and stirred for 10 min. PPh3 (2.83 g, 8.544 mmol) was added and left stirring for 12 h at room temperature. The mixture was concentrated and the residue was purified through column chromatography over silica (elution with 10% ethyl acetate in hexane) to yield 850 mg (79%) of the title compound as white solid. LC-MS: 381.1 [M+1]+.