Borane → 8-(4-Hydroxymethyl-bicyclo[2.2.2]oct-1-yl)-1,3-dipropyl-3,7-dihydro-purine-2,6-dione

HRID 2105688Notes

Reaction equation

HRID 2105688 reaction equation
[O:1]=[C:2]1[N:10]([CH2:11][CH2:12][CH3:13])[C:9]2[N:8]=[C:7]([C:14]34[CH2:21][CH2:20][C:17]([C:22](O)=[O:23])([CH2:18][CH2:19]3)[CH2:16][CH2:15]4)[NH:6][C:5]=2[C:4](=[O:25])[N:3]1[CH2:26][CH2:27][CH3:28].B>C1COCC1>[OH:23][CH2:22][C:17]12[CH2:18][CH2:19][C:14]([C:7]3[NH:6][C:5]4[C:4](=[O:25])[N:3]([CH2:26][CH2:27][CH3:28])[C:2](=[O:1])[N:10]([CH2:11][CH2:12][CH3:13])[C:9]=4[N:8]=3)([CH2:21][CH2:20]1)[CH2:15][CH2:16]2

Participants

4

Reactant 2

HCID 6331BoraneHCID 98865894-(2,6-dioxo-1,3-dipropyl-2,3,6,7-tetrahydro-1H-purin-8-yl)-bicyclo[2.2.2]octane-1-carboxylic acid2×

Product 1

HCID 119956518-(4-Hydroxymethyl-bicyclo[2.2.2]oct-1-yl)-1,3-dipropyl-3,7-dihydro-purine-2,6-dione

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

4-(2,6-Dioxo-1,3-dipropyl-2,3,6,7-tetrahydro-1H-purin-8-yl)-bicyclo[2.2.2]octane-1-carboxylic acid, IX, Example 85b, 0.82 kg) and tetrahydrofuran (9.02.1) are mixed under nitrogen and borane.tetrahydrofuran complex (1 M) in THF (4.18 l) is added at such a rate as to maintain the internal temperature between 10 to 20°. The reaction mixture is stirred at 10 to 200 for 17 hours until all of the starting material is consumed (TLC; dichloromethane/methanol, 9/1; visualization UV then potassium permanganate). Methanol (3.44 l) is added to the reaction mixture, and the mixture is heated to reflux for 1 hr. The reaction is cooled to between 15 and 40° and the solvent removed by reduced pressure at 40 to 45°. The residue is partitioned between ethyl acetate (13.61 l) and hydrochloric acid (1 M, 2.23 l) and the aqueous layer is removed with any undissolved solid material. The mixture is clarified and the residual organic phase from the filtration of the aqueous layer/solid mixture is combined with the bulk organic layer. Saturated sodium hydrogen carbonate (2.23 l) is added and the layers separated, retaining any solids with the aqueous phase. The aqueous phase/solid mixture is filtered and the residual organic phase from these mother liquors are combined with the bulk organic layer. The combined organic layers are washed with saturated saline (2.23 l), the layers are separated and residual solids are retained with the aqueous phase. The aqueous layer/solid mixture is filtered and organics in the mother liquors from the filtration are combined with the bulk organic layer, dried with magnesium sulfate (0.41 kg), filtered, washed with ethyl acetate (0.82 l) and the solvent removed under reduced pressure at 40 to 45°to give the title compound.

Workup

  1. temperatureto maintain the internal temperature between 10 to 20°
  2. customis consumed (TLC
  3. additionMethanol (3.44 l) is added to the reaction mixture
  4. temperaturethe mixture is heated
  5. temperatureto reflux for 1 hr
  6. temperatureThe reaction is cooled to between 15 and 40°
  7. customthe solvent removed by reduced pressure at 40 to 45°
  8. customThe residue is partitioned between ethyl acetate (13.61 l) and hydrochloric acid (1 M, 2.23 l)
  9. customthe aqueous layer is removed with any undissolved solid material
  10. filtrationthe residual organic phase from the filtration of the aqueous layer/solid mixture
  11. additionSaturated sodium hydrogen carbonate (2.23 l) is added
  12. customthe layers separated
  13. filtrationThe aqueous phase/solid mixture is filtered
  14. washThe combined organic layers are washed with saturated saline (2.23 l)
  15. customthe layers are separated
  16. filtrationThe aqueous layer/solid mixture is filtered and organics in the mother liquors from the filtration
  17. dry with materialdried with magnesium sulfate (0.41 kg)
  18. filtrationfiltered
  19. washwashed with ethyl acetate (0.82 l)
  20. customthe solvent removed under reduced pressure at 40 to 45°to

Sources & evidence

ORD record
ord-37d7c3496a3440149e4e5f83d21ef2a5
Source dataset
uspto-grants-2009_08
Patent number
US07579354B2

Reaction notes

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