Hydrochloric Acid → (3AS,6aR)-1,3-dibenzyltetrahydro-1H-furo(3,4-d)imidazole-2,4-dione

HRID 2413395Notes

Reaction equation

HRID 2413395 reaction equation
[CH2:1]([N:8]1[C@@H:12]([C:13](OC)=[O:14])[C@@H:11]([C:17](O)=[O:18])[N:10]([CH2:20][C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[C:9]1=[O:27])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)(C)C.[BH4-].[Na+].Cl>O1CCCC1.O.C(Cl)(Cl)Cl>[CH2:20]([N:10]1[C@H:11]2[CH2:17][O:18][C:13](=[O:14])[C@H:12]2[N:8]([CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)[C:9]1=[O:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1

Participants

8

Reactant 4

HCID 313Hydrochloric AcidHCID 3776IsopropanolHCID 4311764Sodium borohydrideHCID 11152843(4S,5R)-1,3-dibenzyl-5-methoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid

Product 1

HCID 119819(3AS,6aR)-1,3-dibenzyltetrahydro-1H-furo(3,4-d)imidazole-2,4-dioneYield 97.5%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6212ChloroformSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of (4S,5R)-1,3-dibenzyl-5-methoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid (mp., 149°-150° C., [α]36525 =-27.7° at c=1 in DMF, 368 mg) in tetrahydrofuran (3 ml) and isopropanol (0.50 g) was added dropwise to a mixture of sodium borohydride (100 mg) and tetrahydrofuran (3 ml) at 5°-10° C. The obtained mixture was allowed to warm up to room temperature and to react at the same temperature for 5 hours. Then, 1N hydrochloric acid (10 ml) was added dropwise to the reaction mixture. The mixture was stirred at 55°-60° C. for 30 minutes. Chloroform (30 ml) and water (30 ml) were added to the mixture. Aqueous layer was separated from organic layer and extracted once with chloroform. The organic layers were combined, washed successively with water, 5% aqueous sodium hydrogen carbonate and water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give (3aS,6aR)-1,3-dibenzylhexahydro-1H-furo[3,4-d]imidazole-2,4-dione (314 mg). M.P., 116°-117° C. [α]D25 =+61.1° (c=1, CHCl3).

Workup

  1. customto react at the same temperature for 5 hours
  2. customAqueous layer was separated from organic layer
  3. extractionextracted once with chloroform
  4. washwashed successively with water, 5% aqueous sodium hydrogen carbonate and water
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-dafbcd538d504cbf9d4d6d58e9068fd3
Source dataset
uspto-grants-1985_01
Patent number
US04496739

Reaction notes

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