Triethylamine → 5-Amino-1-(5-carboxy-2-methyl-phenyl)-1H-pyrazole-4-carboxylic acid ethyl ester

HRID 1959517

반응식

HRID 1959517 반응식
Cl.[NH:2]([C:4]1[CH:5]=[C:6]([CH:10]=[CH:11][C:12]=1[CH3:13])[C:7]([OH:9])=[O:8])[NH2:3].[CH2:14]([O:16][C:17](=[O:26])[C:18]([C:24]#[N:25])=[C:19]=COCC)[CH3:15].C(N(CC)CC)C>C(O)C>[CH2:14]([O:16][C:17]([C:18]1[CH:19]=[N:3][N:2]([C:4]2[CH:5]=[C:6]([C:7]([OH:9])=[O:8])[CH:10]=[CH:11][C:12]=2[CH3:13])[C:24]=1[NH2:25])=[O:26])[CH3:15]

참가 물질

5

반응물 3

HCID 8471Triethylamine2회HCID 567775083-Hydrazino-4-methylbenzoic acid hydrochloride2회HCID 86652221Ethyl(ethoxymethylene)cyanoacrylate

생성물 1

HCID 580890025-Amino-1-(5-carboxy-2-methyl-phenyl)-1H-pyrazole-4-carboxylic acid ethyl ester수율 68%

시약·촉매·용매 1

HCID 702Ethanol용매

반응 조건

온도
65 °C

실험 절차

To a stirred solution of 3-hydrazino-4-methylbenzoic acid hydrochloride (Example 3A, 478 mg, 2.36 mmol, 1.0 eq) in 20 mL of ethanol were added ethyl(ethoxymethylene)cyanoacrylate (399 mg, 2.36 mmol, 1.0 eq) and triethylamine (329 μL, 2.36 mmol, 1.0 eq) and the mixture was heated at 65° C. for 5 hrs. After standing at room temperature overnight, additional 3-hydrazino-4-methylbenzoic acid hydrochloride (159 mg, 0.78 mmol, 0.3 eq) and triethylamine (110 μL, 0.78 mmol, 0.3 eq) and heated for 2.5. The mixture was cooled to room temperature and concentrated. The crude residue was purified by flash chromatography on silica gel (gradient elution from 7/3 hexanes/EtOAc to 1/1 to elute byproducts followed by EtOAc and 9/1 EtOAc/MeOH to elute product) to provide the product as a brown solid (464 mg, 68%). HPLC (4 minute 10-95 gradient) tR1.87 min; MS m/z 290.1 [M+H]+; 1H NMR (CD3OD), δ 8.08 (d, J=7.0 Hz, 1H), 7.93 (s, 1H), 7.76 (s, 1H), 7.54 (d, J=8.0 Hz, 1H), 4.29 (q, J=7.1 Hz, 2H), 2.19 (s, 3H), 1.35 (d, J=7.1 Hz, 3H), ppm; 13C NMR (CD3OD), δ 166.5, 163.8, 150.4, 141.7, 139.9, 135.3, 130.8, 129.5, 128.6, 93.8, 58.8, 15.8, 12.9 ppm.

후처리

  1. temperatureThe mixture was cooled to room temperature
  2. concentrationconcentrated
  3. customThe crude residue was purified by flash chromatography on silica gel (gradient elution from 7/3 hexanes/EtOAc to 1/1 to elute byproducts followed by EtOAc and 9/1 EtOAc/MeOH to elute product)

출처 및 근거

ORD 기록
ord-18c7f7b0ee7948a89b57436739b52b31
출처 데이터셋
uspto-grants-2013_04
특허 번호
US08410160B2

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