1H-Pyrazol-3-amine, 5-methyl- → 2-Chloro-n-(5-methyl-1h-pyrazol-3-yl)quinazolin-4-amine

HRID 38183

反応式

HRID 38183 の反応式
[Cl:1][C:2]1[N:11]=[C:10](Cl)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]=1.[CH3:13][C:14]1[NH:18][N:17]=[C:16]([NH2:19])[CH:15]=1>C(O)C>[Cl:1][C:2]1[N:11]=[C:10]([NH:19][C:16]2[CH:15]=[C:14]([CH3:13])[NH:18][N:17]=2)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]=1

参加物

4

反応物 2

HCID 931461H-Pyrazol-3-amine, 5-methyl-HCID 2528862,4-Dichloroquinazoline

生成物 1

HCID 219391632-Chloro-n-(5-methyl-1h-pyrazol-3-yl)quinazolin-4-amine収率 93%

試薬・触媒・溶媒 1

HCID 702Ethanol溶媒

実験手順

A suspension of 1H-quinazoline-2,4-dione (10.0 g, 61.7 mmol) in POCl3 (60 mL, 644 mmol) and N,N-dimethylaniline (8 mL, 63.1 mmol) was heated under reflux for 2 h. The excess POCl3 was removed in vacuo, the residue poured into ice, and the resulting precipitate collected by filtration. The crude solid product 2,4-dichloro-quinazoline (6.5 g, 53% yield) was washed with water and dried under vacuum for next step use without further purification. To a solution of the 2,4-dichloro-quinazoline (3.3 g, 16.6 mmol) in anhydrous ethanol (150 mL) was added 5-methyl-1H-pyrazol-3-yl amine (3.2 g, 32.9 mmol) and the resulting mixture was stirred at room temperature for 4 hours. The resulting precipitate was collected by filtration, washed with ethanol, and dried under vacuum to afford 4.0 g (93% yield) of (2-chloro-quinazolin-4-yl)-(5-methyl-1H-pyrazol-3-yl)-amine which was used in the next step without further purification. To a solution of the (2-chloro-quinazolin-4-yl)-(5-methyl-1H-pyrazol-3-yl)-amine (50 mg, 0.19 mmol) in DMF (1.0 mL) was added m-tolyl boronic acid (0.38 mmol), 2M Na2CO3 (0.96 mmol), and tri-t-butylphosphine (0.19 mmol). The flask was flushed with nitrogen and the catalyst PdCl2 (dppf) (0.011 mmol) added in one portion. The reaction mixture was then heated at 80° C. for 10 hours, cooled to room temperature, and poured into water (2 mL). The resulting precipitate was collected by filtration, washed with water, and purified by HPLC to afford III-50 as a pale yellow solid (61 mg, 75%): 1H NMR (500 MHz, DMSO-d6) δ 12.3 (br s, 1H), 10.4 (br s, 1H), 8.75 (d, 1H), 8.30 (s, 1H), 8.25 (d, 1H), 7.78 (s, 2H), 7.55 (m, 1H), 7.45 (m, 1H), 7.35 (m, 1H), 6.80 (s, 1H), 2.47 (s, 3H), 2.30 (s, 3H); MS 316.1 (M+H).

後処理

  1. customdried under vacuum for next step use without further purification
  2. filtrationThe resulting precipitate was collected by filtration
  3. washwashed with ethanol
  4. customdried under vacuum

出典と根拠

ORDレコード
ord-94ba0f6037354b3b868b5faee2209719
出典データセット
uspto-grants-2013_09
特許番号
US08524720B2

関連ノート

読み込み中…