Citric Acid → (R)-5-(6-cyclohexyl-1-(hydroxyamino)-1-oxohexan-3-yl)-N-methyl-1,2,4-oxadiazole-3-carboxamide

HRID 1279767ノート

反応式

HRID 1279767 の反応式
[CH:1]1([CH2:7][CH2:8][CH2:9][C@@H:10]([C:15]2[O:19][N:18]=[C:17]([C:20]([NH:22][CH3:23])=[O:21])[N:16]=2)[CH2:11][C:12](O)=[O:13])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.CN1CCOCC1.ClC(OCC(C)C)=O.C[Si](C)(C)[O:41][NH2:42].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O1CCCC1.O>[CH:1]1([CH2:7][CH2:8][CH2:9][C@@H:10]([C:15]2[O:19][N:18]=[C:17]([C:20]([NH:22][CH3:23])=[O:21])[N:16]=2)[CH2:11][C:12]([NH:42][OH:41])=[O:13])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1

参加物

8

反応物 5

HCID 311Citric AcidHCID 79724-MethylmorpholineHCID 62365Isobutyl chloroformateHCID 2734666O-(Trimethylsilyl)hydroxylamineHCID 59909843(3R)-6-cyclohexyl-3-{3-[(methylamino)carbonyl]-1,2,4-oxadiazol-5-yl}hexanoic acid

生成物 1

HCID 9902427(R)-5-(6-cyclohexyl-1-(hydroxyamino)-1-oxohexan-3-yl)-N-methyl-1,2,4-oxadiazole-3-carboxamide収率 43.7%

試薬・触媒・溶媒 2

HCID 962Water溶媒HCID 8028Tetrahydrofuran溶媒

実験手順

A solution of (3R)-6-cyclohexyl-3-{3-[(methylamino)carbonyl]-1,2,4-oxadiazol-5-yl}hexanoic acid (Preparation 8) (285 mg, 0.88 mmol) and N-methylmorpholine (110 μl, 1.00 mmol) in anhydrous tetrahydrofuran (10 ml) was cooled to 0° C., treated with isobutyl chloroformate (130 μl, 1.00 mmol) and stirred under a nitrogen atmosphere for 1 hour. O-(Trimethylsilyl)hydroxylamine (130 μl, 1.06 mmol) was added and the mixture was stirred for 18 hours, being allowed to warm to room temperature over this time. The mixture was then treated with aqueous citric acid solution (10% w/v, 10 ml) and stirred for 2 hours. This mixture was diluted with water and extracted with ethyl acetate (×3). The combined organic layers were washed sequentially with water and brine, dried over anhydrous sodium sulphate, filtered and the solvent removed under reduced pressure. The solid was then recrystallised from hexane: ethyl acetate to afford the title compound as a white solid (130 mg).

後処理

  1. stirringthe mixture was stirred for 18 hours
  2. stirringstirred for 2 hours
  3. extractionextracted with ethyl acetate (×3)
  4. washThe combined organic layers were washed sequentially with water and brine
  5. dry with materialdried over anhydrous sodium sulphate
  6. filtrationfiltered
  7. customthe solvent removed under reduced pressure
  8. customThe solid was then recrystallised from hexane

出典と根拠

ORDレコード
ord-97e882ff9ae647deb28f06f04fd2280b
出典データセット
uspto-grants-2002_09
特許番号
US06448278B2

反応ノート

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