Water → tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate

HRID 1480571Notes

Reaction equation

HRID 1480571 reaction equation
O.[OH-].[Li+].BrC1C=CC(C([O:11][C@H:12]2[C:16]3[N:17]=[CH:18][N:19]=[C:20]([N:21]4[CH2:26][CH2:25][N:24]([C:27]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:28])[CH2:23][CH2:22]4)[C:15]=3[C@H:14]([CH3:34])[CH2:13]2)=O)=CC=1.O>C1COCC1>[OH:11][C@H:12]1[C:16]2[N:17]=[CH:18][N:19]=[C:20]([N:21]3[CH2:26][CH2:25][N:24]([C:27]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:28])[CH2:23][CH2:22]3)[C:15]=2[C@H:14]([CH3:34])[CH2:13]1

Participants

5

Reactant 3

HCID 962WaterHCID 168937Lithium hydroxide, monohydrateHCID 66845336HCID 66845336, compound

Product 1

HCID 59580343tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylateYield 101.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Lithium hydroxide hydrate (0.779 mL, 28.0 mmol) was added to a solution of tert-butyl 4-((5R,7R)-7-(4-bromobenzoyloxy)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (5.8 g, 11.2 mmol) in THF:H2O (150 mL, 2:1) at 0° C. The mixture was allowed to warm to room temperature and stirred at for 1 hour. The mixture was concentrated in vacuo, taken up into saturated sodium bicarbonate (100 mL) and extracted into EtOAc (2×200 mL). The reaction was dried over Na2SO4 and concentrated in vacuo to give tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (3.8 g, 11.4 mmol, 100% yield) as a foam. Similarly, tert-butyl 4-05R,7S)-7-(4-bromobenzoyloxy)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (1.29 g, 2.49 mmol) was dissolved in THF:H2O (10 mL, 2:1), cooled to 0° C. and then treated with solid lithium hydroxide hydrate. The solution was stirred at ambient temperature for 16 hours. The reaction was quenched with saturated NH4Cl and concentrated in vacuo. The resulting residue was diluted with ethyl acetate and a small amount of water. The layers were separated, and the aqueous layer was washed with ethyl acetate. The combined organic layers were washed with saturated NaHCO3 (2×), saturated NaCl, dried over Na2SO4 and concentrated in vacuo. The resulting residue was dried under high vacuum to give tert-butyl 4-((5R,7S)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate as a foam (0.843 g, 100%).

Workup

  1. customat 0° C
  2. concentrationThe mixture was concentrated in vacuo
  3. extractionextracted into EtOAc (2×200 mL)
  4. dry with materialThe reaction was dried over Na2SO4
  5. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-ca440e84c34f4b088e7fad48b9a35280
Source dataset
uspto-grants-2016_08
Patent number
US09409886B2

Reaction notes

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