Ethyl Acetate → 9-benzyloxy-6-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione

HRID 2169253Notes

Reaction equation

HRID 2169253 reaction equation
O[CH2:2][CH2:3][N:4]([CH:36]([CH3:38])[CH3:37])[C:5]([C:7]1[C:12]([O:13][CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[C:11]([OH:21])[N:10]=[C:9]([CH2:22][C:23]2([C:28]3[CH:33]=[C:32]([Cl:34])[CH:31]=[CH:30][C:29]=3[Cl:35])[CH2:27][CH2:26][CH2:25][CH2:24]2)[N:8]=1)=[O:6].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O.C(OCC)(=O)C>O1CCCC1>[CH2:14]([O:13][C:12]1[C:11](=[O:21])[N:10]=[C:9]([CH2:22][C:23]2([C:28]3[CH:33]=[C:32]([Cl:34])[CH:31]=[CH:30][C:29]=3[Cl:35])[CH2:27][CH2:26][CH2:25][CH2:24]2)[N:8]2[CH2:2][CH2:3][N:4]([CH:36]([CH3:37])[CH3:38])[C:5](=[O:6])[C:7]=12)[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1

Participants

6

Reactant 4

HCID 8857Ethyl AcetateHCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 178457446HCID 178457446, compound

Product 1

HCID 867259049-benzyloxy-6-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dioneYield 33.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 5-benzyloxy-2-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-6-hydroxypyrimidine-4-carboxylic acid (2-hydroxyethyl)-isopropylamide (207) (125 mg, 0.22 mmol) in tetrahydrofuran (5 mL) were added triphenyl phosphine (117 mg, 0.45 mmol) and diisopropyl azodicarboxylate (0.09 mL, 0.45 mmol) at room temperature, a yellow clear solution was formed, after 5 min it turned into a light yellow hazy solution. The solution was stirred for 2 h at room temperature. Silica thin layer chromatography was performed (100% ethyl acetate, Rf=0.3). The mixture was concentrated under reduced pressure to get a crude product, which was purified by a CombiFlash column (eluted at 2-5% methanol in dichloromethane) to get 9-benzyloxy-6-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione (208) (40 mg, 33.07%) as a white sticky solid.

Workup

  1. customa yellow clear solution was formed, after 5 min it
  2. concentrationThe mixture was concentrated under reduced pressure
  3. customto get a crude product, which
  4. customwas purified by a CombiFlash column (eluted at 2-5% methanol in dichloromethane)

Sources & evidence

ORD record
ord-e6ba97901bde4fc59e19dcc95358dee7
Source dataset
uspto-grants-2015_06
Patent number
US09045486B2

Reaction notes

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