Hydrochloric Acid → 1-(4-(1,3,4-oxadiazol-2-yl)phenyl)-3-tert-butyl-1H-pyrazole-5-carboxylic acid

HRID 1930431ノート

反応式

HRID 1930431 の反応式
[O:1]1[CH:5]=[N:4][N:3]=[C:2]1[C:6]1[CH:11]=[CH:10][C:9]([N:12]2[C:16]([C:17]([O:19]CC)=[O:18])=[CH:15][C:14]([C:22]([CH3:25])([CH3:24])[CH3:23])=[N:13]2)=[CH:8][CH:7]=1.C1COCC1.[OH-].[Li+].Cl>O.CO>[O:1]1[CH:5]=[N:4][N:3]=[C:2]1[C:6]1[CH:11]=[CH:10][C:9]([N:12]2[C:16]([C:17]([OH:19])=[O:18])=[CH:15][C:14]([C:22]([CH3:25])([CH3:24])[CH3:23])=[N:13]2)=[CH:8][CH:7]=1

参加物

7

反応物 4

HCID 313Hydrochloric AcidHCID 3939Lithium HydroxideHCID 8028TetrahydrofuranHCID 69036833ethyl 1-(4-(1,3,4-oxadiazol-2-yl)phenyl)-3-tert-butyl-1H-pyrazole-5-carboxylate

生成物 1

HCID 690359881-(4-(1,3,4-oxadiazol-2-yl)phenyl)-3-tert-butyl-1H-pyrazole-5-carboxylic acid収率 88.1%

試薬・触媒・溶媒 2

HCID 887Methanol溶媒HCID 962Water溶媒2 回

反応条件

温度
0 °C

実験手順

A solution of ethyl 1-(4-(1,3,4-oxadiazol-2-yl)phenyl)-3-tert-butyl-1H-pyrazole-5-carboxylate (440 mg, 1.29 mmol) in a mixture comprised of THF (3 mL), methanol (1 mL) and water (1 mL) was cooled to 0° C. and treated with lithium hydroxide (62 mg, 2.59 mmol). The reaction mixture was stirred 3 h at 0° C. and was then allowed to warm to RT over 4 h. Water (15 mL) was added and the mixture was extracted with ether (2×10 mL). The aqueous portion was acidified by addition of 1 M aq HCl (2.5 mL, 2.5 mmol) and was extracted with EtOAc (3×20 mL). The organics were dried (Na2SO4) and concentrated in vacuo to provide 1-(4-(1,3,4-oxadiazol-2-yl)phenyl)-3-tert-butyl-1H-pyrazole-5-carboxylic acid (355 mg, 88% yield). 1H NMR (400 MHz, DMSO-d6): δ 13.35 (br s, 1 H), 9.40 (d, J=3.4 Hz, 1 H), 8.11 (m, 2 H), 7.69 (m, 2 H), 7.01 (d, J=3.2 Hz, 1 H), 1.32 (s, 9 H); MS (ESI) m/z: 313.0 (M+H+).

後処理

  1. temperatureto warm to RT over 4 h
  2. extractionthe mixture was extracted with ether (2×10 mL)
  3. extractionwas extracted with EtOAc (3×20 mL)
  4. dry with materialThe organics were dried (Na2SO4)
  5. concentrationconcentrated in vacuo

出典と根拠

ORDレコード
ord-1062c5427487489caab690c6f0d27cdd
出典データセット
uspto-grants-2012_05
特許番号
US08188113B2

反応ノート

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