Sodium Hydroxide → 5-(3-methylbutyl)-1H-pyrazole-3-carboxylic Acid

HRID 1434756ノート

反応式

HRID 1434756 の反応式
[OH-].[Na+].C([O:5][C:6]([C:8]1[CH:12]=[C:11]([CH2:13][CH2:14][CH:15]([CH3:17])[CH3:16])[NH:10][N:9]=1)=[O:7])C>CO>[CH3:16][CH:15]([CH3:17])[CH2:14][CH2:13][C:11]1[NH:10][N:9]=[C:8]([C:6]([OH:7])=[O:5])[CH:12]=1

参加物

4

反応物 2

HCID 14798Sodium HydroxideHCID 574350915-(3-methylbutyl)-1H-pyrazole-3-carboxylic Acid Ethyl Ester

生成物 1

HCID 118456535-(3-methylbutyl)-1H-pyrazole-3-carboxylic Acid収率 97.6%

試薬・触媒・溶媒 1

HCID 887Methanol溶媒

実験手順

Freshly prepared aq. NaOH (10 M in H2O, 80.85 mmol) was added to a stirring, room temperature solution of 47 (3.40 g, 16.17 mmol) in MeOH (40.4 mL, 0.4 M) under N2. The reaction was then heated to reflux until the reaction was judged complete by HPLC (6 min): The reaction was concentrated and then dissolved in 14 mL H2O. 10% aq. HCl was added dropwise until the pH=2. The white solid that precipitated from the reaction was filtered off and washed with cold H2O. The solid was dried under vacuum overnight to obtain 2.8753 g (97.6%) of 48. (Note: An undesired impurity has a retention time of 9.522 min by HPLC.) 1H (CDCl3, 400 MHz): δ 6.61 (1H, s), 2.70 (2H, t, J=7.8 Hz), 1.63-1.51 (3H, m), 0.94 (6H, d, J=6.3 Hz) ppm. 13C (CDCl3, 100 MHz): δ 164.35, 149.48, 143.00, 107.34, 39.35, 28.71, 24.69, 22.65 ppm. DEPT (CDCl3, 100 MHz): CH3 carbons: 22.65; CH2 carbons: 39.35, 24.69; CH carbons: 107.34, 28.71 ppm. HPLC: 9.522 min.

後処理

  1. temperatureThe reaction was then heated
  2. temperatureto reflux until the reaction
  3. customwas judged complete by HPLC (6 min)
  4. concentrationThe reaction was concentrated
  5. dissolutiondissolved in 14 mL H2O
  6. addition10% aq. HCl was added dropwise until the pH=2
  7. customThe white solid that precipitated from the reaction
  8. filtrationwas filtered off
  9. washwashed with cold H2O
  10. customThe solid was dried under vacuum overnight

出典と根拠

ORDレコード
ord-d65b978130de45a0bb73d04460199246
出典データセット
uspto-grants-2009_11
特許番号
US07615572B2

反応ノート

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