Trifluoroacetic acid → 2-Amino-3-(1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl)-propionic acid methyl ester

HRID 1177730

反応式

HRID 1177730 の反応式
[CH3:1][O:2][C:3](=[O:30])[CH:4]([N:15](C(OC(C)(C)C)=O)C(OC(C)(C)C)=O)[CH2:5][N:6]1[CH2:11][CH2:10][C:9]2[NH:12][N:13]=[CH:14][C:8]=2[CH2:7]1.FC(F)(F)C(O)=O>C(Cl)Cl>[CH3:1][O:2][C:3](=[O:30])[CH:4]([NH2:15])[CH2:5][N:6]1[CH2:11][CH2:10][C:9]2[NH:12][N:13]=[CH:14][C:8]=2[CH2:7]1

参加物

4

反応物 2

HCID 6422Trifluoroacetic acidHCID 588643312-(Di-tert-butoxycarbonylamino)-3-(1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl)-propionic acid methyl ester

生成物 1

HCID 588644802-Amino-3-(1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl)-propionic acid methyl ester収率 95%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

To a solution of 2-(di-tert-butoxycarbonylamino)-3-(1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl)-propionic acid methyl ester (0.55 g, 1 equiv.) in methylene chloride (5 mL, 0° C.) was added trifluoroacetic acid (1.5 mL). The ice bath was removed and stirring continued for 2 h. The solution was concentrated, redissolved in methanol, and passed onto a column of strong cation exchange resin. After flushing with methanol, the product was removed from the column by eluting with 2 M ammonia in methanol to afford the product as its free base (275 mg, 95%). 1H-NMR (CDCl3, 500 MHz) δ 2.71 (dd, J=12.8, 8.6, 1H), 2.74-2.91 (m, 6H), 3.48 (s, 2H), 3.54 (d, J=13.4, 1H), 3.62 (d, J=13.4, 1H), 3.69 (dd, J=8.2, 4.9, 1H), 3.73 (s, 3H), 7.27 (s, 1H). Mass spec.: 225.16 (MH)+.

後処理

  1. customThe ice bath was removed
  2. concentrationThe solution was concentrated
  3. dissolutionredissolved in methanol
  4. customAfter flushing with methanol
  5. customthe product was removed from the column
  6. washby eluting with 2 M ammonia in methanol

出典と根拠

ORDレコード
ord-f6e441f52fe541bfbab4029ac5828018
出典データセット
uspto-grants-2010_11
特許番号
US07842808B2

関連ノート

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