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

HRID 1480550Notes

Reaction equation

HRID 1480550 reaction equation
C(N(CC)CC)C.[CH3:8][C@H:9]1[C:17]2[C:16]([N:18]3[CH2:23][CH2:22][N:21]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])[CH2:20][CH2:19]3)=[N:15][CH:14]=[N:13][C:12]=2[C:11](=[O:31])[CH2:10]1.O[C@H]1C2N=CN=C(N3CCN(C(OC(C)(C)C)=O)CC3)C=2[C@H](C)C1>C(Cl)Cl>[OH:31][C@@H:11]1[C:12]2[N:13]=[CH:14][N:15]=[C:16]([N:18]3[CH2:23][CH2:22][N:21]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])[CH2:20][CH2:19]3)[C:17]=2[C@H:9]([CH3:8])[CH2:10]1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 59580343tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylateHCID 59580350(R)-tert-butyl 4-(5-methyl-7-oxo-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate

Product 1

HCID 59580357tert-Butyl 4-((5R,7S)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylateYield 95.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Triethylamine (4.33 mL, 31.1 mmol; degassed with nitrogen 30 minutes prior to use) and formic acid (1.36 mL, 36.1 mmol; degassed with nitrogen 30 minutes prior to use) were added to a solution of (R)-tert-butyl 4-(5-methyl-7-oxo-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (9.75 g, 29.3 mmol) in DCM (210 mL; degassed with nitrogen 30 minutes prior to use). The mixture was stirred for 5 minutes, then a Ru catalyst (0.0933 g, 0.147 mmol) was added. The reaction was stirred under positive nitrogen pressure overnight (18 hours). The reaction mixture was concentrated to dryness and dried on high vacuum. The impure material was flashed on Biotage 65M loaded 1:1 DCM:ethyl acetate 500 mL flushed, then 1:4 DCM:ethyl acetate until product (2nd spot), then gradient to neat ethyl acetate, then 25:1 DCM:MeOH eluted rest of product. The fractions were combined and concentrated on a rotary evaporator. The residue was concentrated again from DCM/hexanes to give a mixture of tert-butyl 4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (major) and tert-butyl 4-((5R,7S)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (minor) (9.35 g, 95.3% yield) as a foam. LC/MS (APCI+) m/z 335 [M+H]+. 1H NMR (CDCl3) shows 88% diastereoselectivity by integration of carbinol methine.

Workup

  1. customdegassed with nitrogen 30 minutes
  2. customdegassed with nitrogen 30 minutes
  3. customdegassed with nitrogen 30 minutes
  4. stirringThe reaction was stirred under positive nitrogen pressure overnight (18 hours)
  5. concentrationThe reaction mixture was concentrated to dryness
  6. customdried on high vacuum
  7. customethyl acetate 500 mL flushed
  8. concentrationconcentrated on a rotary evaporator
  9. concentrationThe residue was concentrated again from DCM/hexanes
  10. customto give

Sources & evidence

ORD record
ord-4b650ca269c346c6a692b2cd76a8d66e
Source dataset
uspto-grants-2016_08
Patent number
US09409886B2

Reaction notes

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