Glycine → (R)-2-benzylbutyrolactone

HRID 1416862ノート

反応式

HRID 1416862 の反応式
NCC(O)=O.[OH-].[Na+].[CH2:8]([CH:15]([CH2:18][CH2:19][OH:20])[CH2:16][OH:17])[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.C1C=[N+]([C@@H]2O[C@H](COP(OP(OC[C@H]3O[C@@H](N4C5N=CN=C(N)C=5N=C4)[C@H](O)[C@@H]3O)(O)=O)([O-])=O)[C@@H](O)[C@H]2O)C=C(C(N)=O)C=1.COC1C=CC(C=O)=CC=1>O.CC(C)=O.C(O)C.C(Cl)Cl>[CH2:8]([C@@H:15]1[CH2:18][CH2:19][O:20][C:16]1=[O:17])[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1

参加物

10

反応物 5

HCID 750Glycine2 回HCID 5892NadideHCID 14798Sodium Hydroxide4 回HCID 312444-MethoxybenzaldehydeHCID 134285472-Benzylbutane-1,4-diol

生成物 1

HCID 11355800(R)-2-benzylbutyrolactone

試薬・触媒・溶媒 4

HCID 180Acetone溶媒HCID 702Ethanol溶媒HCID 962Water溶媒HCID 6344Dichloromethane溶媒

実験手順

Glycine (18.8 grams) is dissolved in 2 liters of deionized water, and the pH is adjusted by the addition of 10% sodium hydroxide to 9.0. 2-Benzyl-1,4-butanediol (10.0 grams) is dissolved in 150 ml of acetone added to the glycine solution with stirring, followed by the addition of β-NAD+ (Sigma, 0.5 grams). To the resulting solution is added horse liver alcohol dehydrogenase (Sigma, 250 mg, approximately 400 units). After the enzyme has dissolved the pH is readjusted to 9.0 with 10% sodium hydroxide, and the reaction mixture is stirred at 30° C. During the reaction, the pH is maintained at 9.0 with a pH-stat by the addition of 10% sodium hydroxide. Progress of the reaction is monitored by thin layer chromatography (Silica gel plates, eluent methylene chloride; visualization by dipping in a solution of 5% anisaldehyde in ethanol and heating). When the reaction is complete as judged by thin layer chromatography, the reaction mixture is adjusted to a pH of 13 with 10 M sodium hydroxide and then extracted 3 times with 250 ml of methylene chloride. The pH of the aqueous mixture is then adjusted to 3 with concentrated HCl, followed by continuous extraction with 1 liter of ethyl acetate for 24 hours. The ethyl acetate extract is dried over anhydrous magnesium sulfate and evaporated under reduced pressure to yield (R)-2-benzylbutyrolactone as a yellowish solid.

後処理

  1. dissolutionAfter the enzyme has dissolved the pH
  2. stirringthe reaction mixture is stirred at 30° C
  3. customDuring the reaction
  4. temperatureheating)
  5. extractionextracted 3 times with 250 ml of methylene chloride
  6. extractionfollowed by continuous extraction with 1 liter of ethyl acetate for 24 hours
  7. extractionThe ethyl acetate extract
  8. dry with materialis dried over anhydrous magnesium sulfate
  9. customevaporated under reduced pressure

出典と根拠

ORDレコード
ord-0340abcfe284489fa1f078a24d667d33
出典データセット
uspto-grants-1999_06
特許番号
US05916786

反応ノート

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