Boron trifluoride etherate → (3AS,6aR)-1,3-dibenzyltetrahydro-1H-furo(3,4-d)imidazole-2,4-dione

HRID 463741ノート

反応式

HRID 463741 の反応式
[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.[BH4-].[Na+].B(F)(F)F.CCOCC.C(=O)([O-])[O-].[K+].[K+]>O1CCCC1>[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

参加物

6

反応物 4

HCID 8000Boron trifluoride etherateHCID 11430Potassium CarbonateHCID 4311764Sodium borohydrideHCID 11428617(4R,5S)-1,3-dibenzyl-5-methoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid

生成物 1

HCID 119819(3AS,6aR)-1,3-dibenzyltetrahydro-1H-furo(3,4-d)imidazole-2,4-dione収率 49.7%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

To a solution of (4R,5S)-1,3-dibenzyl-5-methoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid (mp., 149°-150° C., [α]36525 =+27.4° at c=1 in DMF, 1.84 g) in tetrahydrofuran (15 ml) were added sodium borohydride (226 mg) in small portions at -20° C., and boron trifluoride etherate (1.06 g). The obtained mixture was stirred at the same temperature for 1 hour and at room temperature for 3 hours, poured into ice-water (50 ml), stirred further at room temperature, adjusted to pH 9 with aqueous potassium carbonate and extracted twice with ethyl acetate (50 ml). Organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by chromatography on silica gel column to give (3aS,6aR)-1,3-dibenzylhexahydro-1H-furo[3,4-d]imidazole-2,4-dione (0.80 g). M.P., 114°-118° C. [α]D 20 =+59.8° (c=1, CHCl3).

後処理

  1. stirringstirred further at room temperature
  2. extractionextracted twice with ethyl acetate (50 ml)
  3. washOrganic layer was washed with saturated aqueous sodium chloride solution
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by chromatography on silica gel column

出典と根拠

ORDレコード
ord-4574fc0046634e2196eab93a4b8511d6
出典データセット
uspto-grants-1985_10
特許番号
US04544635

反応ノート

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