Methanol → Ethyl 6-iodo-[1,2,4]triazolo[4,3-b]pyridazine-3-carboxylate

HRID 1930084노트

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HRID 1930084 반응식
[NH:1]([C:3]1[N:4]=[N:5][C:6]([I:9])=[CH:7][CH:8]=1)[NH2:2].CO.[CH2:12]([O:14][C:15](=[O:18])[CH:16]=O)[CH3:13].C(O)(=O)C.C(O)(=O)C.IC1C=CC=CC=1>C(Cl)Cl>[I:9][C:6]1[CH:7]=[CH:8][C:3]2[N:4]([C:16]([C:15]([O:14][CH2:12][CH3:13])=[O:18])=[N:2][N:1]=2)[N:5]=1

참가 물질

6

반응물 4

HCID 887MethanolHCID 70211Ethyl oxoacetateHCID 114362833-Hydrazinyl-6-iodopyridazineHCID 12217721Iodo benzene diacetate

생성물 1

HCID 57929862Ethyl 6-iodo-[1,2,4]triazolo[4,3-b]pyridazine-3-carboxylate수율 65.9%

시약·촉매·용매 1

HCID 6344Dichloromethane용매

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온도
40 °C

실험 절차

In a 1 L round-bottomed flask was added 3-hydrazinyl-6-iodopyridazine (60.6 g, 257 mmol, prepared using General Procedure D from 3-chloro-6-iodopyridazine [Example #9 Step A] with hydrazine hydrate) and MeOH (600 mL) to give a tan suspension. A solution of glyoxylic acid ethyl ester (50 wt % in toluene, 54.9 mL, 270 mmol, Fluka) was added. The mixture was heated at about 40° C. for about 2 h. The reaction mixture was cooled to ambient temperature and the solvent was removed in vacuo. The residue was dissolved in DCM (600 mL) and iodobenzene diacetate (99.0 g, 308 mmol) was added and the mixture was stirred overnight. The reaction mixture was diluted with additional DCM (600 mL) and extracted with water (600 mL). The organic layer was dried over MgSO4 and concentrated in vacuo. The solid was triturated with EtOAc (500 mL) and then collected by filtration. The solid was washed with additional EtOAc (250 mL) and then dried in vacuo to give title compound (53.9 g, 65%). LC/MS (Table 1, Method g) Rt=1.18 min; MS m/z: 319.0 (M+H)+. 1H NMR (DMSO-d6) δ 8.29 (m, 1H), 7.84 (m, 1H), 4.48 (m, 2H), 1.39 (t, 3H).

후처리

  1. customto give a tan suspension
  2. temperatureThe reaction mixture was cooled to ambient temperature
  3. customthe solvent was removed in vacuo
  4. dissolutionThe residue was dissolved in DCM (600 mL)
  5. extractionextracted with water (600 mL)
  6. dry with materialThe organic layer was dried over MgSO4
  7. concentrationconcentrated in vacuo
  8. customThe solid was triturated with EtOAc (500 mL)
  9. filtrationcollected by filtration
  10. washThe solid was washed with additional EtOAc (250 mL)
  11. customdried in vacuo

출처 및 근거

ORD 기록
ord-e48659f8146349e6bb38418c72318ba8
출처 데이터셋
uspto-grants-2012_05
특허 번호
US08188083B2

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