Sodium Carbonate → (7RS,8aSR)-7-(4-Fluorophenoxy)methyl-2-(5-fluoropyrimidin-2-yl)-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine

HRID 861339Notes

Reaction equation

HRID 861339 reaction equation
[F:1][C:2]1[CH:25]=[CH:24][C:5]([O:6][CH2:7][CH:8]2[CH2:23][N:11]3[CH2:12][CH2:13][N:14]([CH2:16]C4C=CC=CC=4)[CH2:15][CH:10]3[CH2:9]2)=[CH:4][CH:3]=1.C([O-])=O.[NH4+].FC1C=CC(OCC2CN3CCNCC3C2)=CC=1.ClC1[N:54]=[CH:53][C:52]([F:55])=[CH:51][N:50]=1.C(=O)([O-])[O-].[Na+].[Na+]>CO.O.[Pd]>[F:1][C:2]1[CH:3]=[CH:4][C:5]([O:6][CH2:7][CH:8]2[CH2:23][N:11]3[CH2:12][CH2:13][N:14]([C:16]4[N:54]=[CH:53][C:52]([F:55])=[CH:51][N:50]=4)[CH2:15][CH:10]3[CH2:9]2)=[CH:24][CH:25]=1

Participants

9

Reactant 5

HCID 10340Sodium CarbonateHCID 5834662-Chloro-5-fluoropyrimidineHCID 2723923Ammonium formateHCID 20682340(7RS,8aSR)-7-(4-fluorophenoxy)methyl-2-phenylmethyl-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazineHCID 20682345(7RS,8aSR)-7-(4-fluorophenoxy)methyl-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine

Product 1

HCID 9798299(7RS,8aSR)-7-(4-Fluorophenoxy)methyl-2-(5-fluoropyrimidin-2-yl)-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazineYield 50%

Reagents, catalysts & solvents 3

HCID 23938PalladiumCatalystHCID 887MethanolSolventHCID 962WaterSolvent

Procedure

A solution of 0.870 g (2.6 mmol) of (7SR,8aSR)-7-(4-fluorophenoxy)methyl-2-phenylmethyl-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine (Preparation 2) and 1.8 mL (8.9 mmol) of 5M aqueous ammonium formate in 50 mL methanol was treated with an aqueous slurry of 0.100 g of 10% Pd/C. The reaction was refluxed for 24 h. The mixture was filtered and the solvent removed in vacuo to give an oily residue. The crude (7SR,8aSR)-7-(4-fluorophenoxy)methyl-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine was combined with 0.373 g (2.8 mmol) of 2-chloro-5-fluoropyrimidine (Dunaiskis, A.; et al. Org. Prep. Proc. Int., 1995, 27, 600-602), 0.650 g (6.1 mmol) of sodium carbonate in 50 mL of water, and the mixture was gently refluxed for 16 hrs. After cooling to room temperature, the mixture was extracted with methylene chloride (3×). The combined organic layers were dried (magnesium sulfate), filtered, and evaporated. Purification by silica gel flash chromatography eluting with 85:15 ethyl acetate:hexane gave 0.444 g (50%) of the title compound. mp (.HCl) 211°-213° C. 13C NMR (base, CDCl3): δ 31.7, 35.2, 43.8, 49.1, 51.4, 56.6, 62.3, 72.5, 115.45, 115.56, 115.89, 144.95, 145.24, 149.9, 153.2, 155.1, 155.6, 158.79, 158.90. Anal calcd for C18H20F2N4O: C, 62.41; H, 5.82; N, 16.18. Found: C, 62.15, H, 5.99; N, 16.38.

Workup

  1. temperatureThe reaction was refluxed for 24 h
  2. filtrationThe mixture was filtered
  3. customthe solvent removed in vacuo
  4. customto give an oily residue
  5. extractionthe mixture was extracted with methylene chloride (3×)
  6. dry with materialThe combined organic layers were dried (magnesium sulfate)
  7. filtrationfiltered
  8. customevaporated
  9. customPurification by silica gel flash chromatography
  10. washeluting with 85:15 ethyl acetate

Sources & evidence

ORD record
ord-2b0d4c5c40034e65b522b25c833a459d
Source dataset
uspto-grants-1998_02
Patent number
US05714487

Reaction notes

Loading…