HCID 68689093, compound → HCID 58911608, compound

HRID 1296298Notes

Reaction equation

[CH2:1]([N:8]1[CH2:22][CH:21]([CH3:23])[N:11]2[C:12](=[O:20])[C:13]3[CH:14]=[CH:15][CH:16]=[CH:17][C:18]=3[CH2:19][CH:10]2[CH2:9]1)C1C=CC=CC=1.[H][H]>[Pd].CO>[CH3:1][N:8]1[CH2:22][C@@H:21]([CH3:23])[N:11]2[C:12](=[O:20])[C:13]3[CH:14]=[CH:15][CH:16]=[CH:17][C:18]=3[CH2:19][C@@H:10]2[CH2:9]1

Participants

Conditions

Temperature: 40 °C

Procedure

1,2,3,4,11,11a-Hexahydro-2-benzyl-4-methyl-pyrazino[1,2-b]isoquinolin-6-one (from Isomer B, 12 mg, 0.04 mmol) and 10% palladium on carbon (5 mg) in MeOH (1 ml) was stirred under a balloon of hydrogen. The catalyst was filtered off and then fresh catalyst added. After stirring an additional 4 h at 40° C. under a balloon of hydrogen, the reaction was filtered through Celite® rinsing with methanol to afford 8 mg of crude product. Column purification (Chiralcel OD, 10% 1/1 MeOH/EtOH in hexanes) afforded pure (4R,11aR)-1,2,3,4,11,11a-hexahydro-2,4-dimethyl-pyrazino[1,2-b]isoquinolin-6-one (1.5 mg, 17% yield) MS (ESI) 231 (M+H). Further elution afforded (4S,1 aS)-1,2,3,4,11,11a-hexahydro-2,4-dimethyl-pyrazino[1,2-b]isoquinolin-6-one (1.6 mg, 18% yield) MS (ESI) 231 (M+H). Further elution also provided (4R,11aR)-1,2,3,4,11,11a-hexahydro-4-methyl-pyrazino[1,2-b]isoquinolin-6-one (2.4 mg, 29% yield) and (4S,11aS)-1,2,3,4,11,11a-hexahydro-4-methyl-pyrazino[1,2-b]isoquinolin-6-one (2.2 mg, 27% yield).

Workup

filtrationThe catalyst was filtered off
additionfresh catalyst added
filtrationthe reaction was filtered through Celite®
washrinsing with methanol
customto afford 8 mg of crude product
customColumn purification (Chiralcel OD, 10% 1/1 MeOH/EtOH in hexanes)

Sources & evidence

ORD record: ord-c8db0a2321024c7c90cdc036b83cd702
Source dataset: uspto-grants-2007_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07244843B2

Reaction notes

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