Sodium Carbonate → (7S,8aS)-7-hydroxymethyl-2-(4-cyanophenyl)-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine

HRID 861371Notes

Reaction equation

[OH:1][CH2:2][C@@H:3]1[CH2:11][N:6]2[CH2:7][CH2:8][NH:9][CH2:10][C@@H:5]2[CH2:4]1.F[C:13]1[CH:20]=[CH:19][C:16]([C:17]#[N:18])=[CH:15][CH:14]=1.C(=O)([O-])[O-].[Na+].[Na+]>CS(C)=O.O>[OH:1][CH2:2][C@@H:3]1[CH2:11][N:6]2[CH2:7][CH2:8][N:9]([C:13]3[CH:20]=[CH:19][C:16]([C:17]#[N:18])=[CH:15][CH:14]=3)[CH2:10][C@@H:5]2[CH2:4]1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 1.5 g (9.6 mmol) of (7S,8aS)-7-hydroxymethyl-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine (Preparation 13, Step A), 1.75 g (14.4 mmol) of 4-fluorobenzonitrile and 2.04 g (19.2 mmol) of sodium carbonate in 10 mL of DMSO was heated at 80° C. for 16 h. The solution was cooled to room temperature, diluted with water and extracted with 1:1 ethyl acetate:diethyl ether (3×). The combined organic phase was dried (magnesium sulfate), filtered and evaporated. Purification by flash silica gel chromatography with 9:1 chloroform: methanol gave 0.925 g (37%) of the title compound. 13C NMR (CDCl3): δ 31.1, 37.2, 46.7, 51.0, 51.8, 57.6, 62.3, 67.3, 100.1, 114.3, 120.0, 133.5, 153.4. m/z (MH+) 258.

Workup

temperatureThe solution was cooled to room temperature
extractionextracted with 1:1 ethyl acetate
dry with materialThe combined organic phase was dried (magnesium sulfate)
filtrationfiltered
customevaporated
customPurification by flash silica gel chromatography with 9:1 chloroform

Sources & evidence

ORD record: ord-5e23b14f00614f898b41fa4526ef5e92
Source dataset: uspto-grants-1998_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05714487

Reaction notes

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