Triethylamine → 7-[5,5-bis(4-fluorophenyl)-4-pentenyl]hexahydro-3,3-dimethylimidazo[1,5-a]pyrazin-1(5H)-one

HRID 1494627Notes

Reaction equation

Br[CH2:2][CH2:3][CH2:4][CH:5]=[C:6]([C:14]1[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=1)[C:7]1[CH:12]=[CH:11][C:10]([F:13])=[CH:9][CH:8]=1.[CH3:21][C:22]1([CH3:32])[N:26]2[CH2:27][CH2:28][NH:29][CH2:30][CH:25]2[C:24](=[O:31])[NH:23]1.C(N(CC)CC)C>CN(C)C=O>[F:13][C:10]1[CH:11]=[CH:12][C:7]([C:6]([C:14]2[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=2)=[CH:5][CH2:4][CH2:3][CH2:2][N:29]2[CH2:28][CH2:27][N:26]3[C:22]([CH3:32])([CH3:21])[NH:23][C:24](=[O:31])[CH:25]3[CH2:30]2)=[CH:8][CH:9]=1

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of 51 parts of 1,1'-(5-bromo-1-penten-1-ylidene)bis[4-fluorobenzene], 25.4 parts of hexahydro-3,3-dimethylimidazo-[1,5-a]pyrazin-1(5H)-one, 35.5 parts of N,N-diethylethanamine and 270 parts of N,N-dimethylformamide was stirred overnight at 70° C. After evaporation, the residue was taken up in trichloromethane. The organic layer was washed with water, dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (96:4 by volume) as eluent. The pure fractions were collected and the eluent was evaporated, yielding 60 parts (94.0%) of 7-[5,5-bis(4-fluorophenyl)-4-pentenyl]hexahydro-3,3-dimethylimidazo[1,5-a]pyrazin-1(5H)-one as a residue (int. 24).

Workup

customAfter evaporation
washThe organic layer was washed with water
customdried
filtrationfiltered
customevaporated
customThe residue was purified by column chromatography over silica gel using
additiona mixture of trichloromethane and methanol (96:4 by volume) as eluent
customThe pure fractions were collected
customthe eluent was evaporated

Sources & evidence

ORD record: ord-02c99b9a9a5746fd95a3bba0b234ef07
Source dataset: uspto-grants-1991_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05026853

Reaction notes

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