1,4-Dioxane hydrochloride → (5R,7R)-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol dihydrochloride

HRID 2200273Notes

Reaction equation

HRID 2200273 reaction equation
[ClH:1].O1CCOCC1.[OH:8][C@H:9]1[C:13]2[N:14]=[CH:15][N:16]=[C:17]([N:18]3[CH2:23][CH2:22][N:21](C(OC(C)(C)C)=O)[CH2:20][CH2:19]3)[C:12]=2[C@H:11]([CH3:31])[CH2:10]1>O1CCOCC1>[ClH:1].[ClH:1].[CH3:31][C@H:11]1[C:12]2[C:17]([N:18]3[CH2:19][CH2:20][NH:21][CH2:22][CH2:23]3)=[N:16][CH:15]=[N:14][C:13]=2[C@H:9]([OH:8])[CH2:10]1

Participants

4

Reactant 2

HCID 204431481,4-Dioxane hydrochlorideHCID 59580343tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate

Product 1

HCID 66618034(5R,7R)-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol dihydrochlorideYield 80%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

4M HCl/dioxane (11.2 ml, 44.9 mmol) was added to a solution of tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (0.600 g, 1.79 mmol) in dioxane (15 mL). The reaction mixture was stirred at room temperature under nitrogen overnight (20 hours). The mixture was concentrated to dryness and dried on high vacuum line. The crude was suspended in ether, sonicated, and stirred for 5 minutes. The solids were isolated by filtration through a medium frit funnel with nitrogen pressure, rinsed with ether, dried under nitrogen pressure, and dried further on a hi vacuum line to give (5R,7R)-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol dihydrochloride (0.440 g, 79.8% yield) as a yellow powder. LC/MS (APCI+) m/z 235. The (5R,7S)-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol dihydrochloride was prepared using an analogous method.

Workup

  1. concentrationThe mixture was concentrated to dryness
  2. customdried on high vacuum line
  3. customsonicated
  4. stirringstirred for 5 minutes
  5. customThe solids were isolated by filtration through a medium frit funnel with nitrogen pressure
  6. washrinsed with ether
  7. customdried under nitrogen pressure
  8. customdried further on a hi vacuum line

Sources & evidence

ORD record
ord-f59ef5df6a914b2fa1ab1710b3f6611f
Source dataset
uspto-grants-2016_06
Patent number
US09359340B2

Reaction notes

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