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

HRID 2169254Notes

Reaction equation

HRID 2169254 reaction equation
C([O:8][C:9]1[C:14](=[O:15])[N:13]=[C:12]([CH2:16][C:17]2([C:22]3[CH:27]=[C:26]([Cl:28])[CH:25]=[CH:24][C:23]=3[Cl:29])[CH2:21][CH2:20][CH2:19][CH2:18]2)[N:11]2[CH2:30][CH2:31][N:32]([CH:35]([CH3:37])[CH3:36])[C:33](=[O:34])[C:10]=12)C1C=CC=CC=1.Cl.C(OCC)(=O)C>CO>[Cl:29][C:23]1[CH:24]=[CH:25][C:26]([Cl:28])=[CH:27][C:22]=1[C:17]1([CH2:16][C:12]2[N:11]3[CH2:30][CH2:31][N:32]([CH:35]([CH3:37])[CH3:36])[C:33](=[O:34])[C:10]3=[C:9]([OH:8])[C:14](=[O:15])[N:13]=2)[CH2:21][CH2:20][CH2:19][CH2:18]1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 8857Ethyl AcetateHCID 867259049-benzyloxy-6-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione

Product 1

HCID 867259056-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-9-hydroxy-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dioneYield 11.34%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a stirred solution of 9-benzyloxy-6-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione (208) (500 mg, 0.93 mmol) in methanol (5.5 mL) was added concentrated HCl (4 mL) and the mixture was stirred for 20 h. Silica thin layer chromatography was performed (100% ethyl acetate, Rf=0.3). Methanol was removed, water was added, the mixture was basified (pH˜8) with solid NaHCO3, extracted with ethyl acetate (3×20 mL), and the organic part was dried and concentrated. The crude product was purified by preparative HPLC purification to get 6-[1-(2,5-dichlorophenyl)-cyclopentylmethyl]-9-hydroxy-2-isopropyl-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione (209) (32 mg, 11.34%) as a light brown solid.

Workup

  1. customMethanol was removed
  2. additionwater was added
  3. extractionextracted with ethyl acetate (3×20 mL)
  4. customthe organic part was dried
  5. concentrationconcentrated
  6. customThe crude product was purified by preparative HPLC purification

Sources & evidence

ORD record
ord-f47f4861811d4552942d62435e88770a
Source dataset
uspto-grants-2015_06
Patent number
US09045486B2

Reaction notes

Loading…