3,4-dihydro-2H-pyran → methyl 5-bromo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carboxylate

HRID 2367695Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2367695
[Br:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][N:6]=[C:5]2[C:11]([O:13][CH3:14])=[O:12].C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1.[O:32]1[CH:37]=[CH:36][CH2:35][CH2:34][CH2:33]1>ClC(Cl)C>[Br:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH:33]1[CH2:34][CH2:35][CH2:36][CH2:37][O:32]1)[N:6]=[C:5]2[C:11]([O:13][CH3:14])=[O:12]

Komponenten

5

Edukt 3

HCID 80803,4-dihydro-2H-pyranHCID 466102Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1)HCID 12689298Methyl 5-bromo-1H-indazole-3-carboxylate

Produkt 1

HCID 69803802methyl 5-bromo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carboxylateAusbeute 82 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 63651,1-DichloroethaneLösungsmittel

Versuchsvorschrift

A suspension of methyl 5-bromo-1H-indazole-3-carboxylate (CXVI) (1.35 g, 5.29 mmol), pyridinium p-toluenesulfonate (0.143 g, 0.56 mmol) and 3,4 dihydro-2H-pyran (1.02 mL, 11.90 mmol) in anhydrous dichloroethane (20 mL) was refluxed 5 h under argon. The suspension was turned into the clear solution. The solution was cooled and the excess solvent was evaporated under vacuum. The residue was dissolved in EtOAc and washed with dilute NaHCO3 solution (satd. NaHCO3 soln/H2O: 1:9). The organic layer was dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography (100% hexanes→5:95 EtOAc:hexanes) to get methyl 5-bromo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carboxylate (CXVII) as a white solid (1.47 g, 4.34 mmol, 82% yield). 1H NMR (DMSO-d6) δ ppm 8.22 (d, J=1.4 Hz, 1H), 7.89 (d, J=7.2 Hz, 1H), 7.68 (dd, J=7.2, 1.6 Hz, 1H), 6.02 (dd, J=8.0, 2.4 Hz, 1H), 3.94 (s, 3H), 3.88 (m, 1H), 3.79 (m, 1H), 2.37-2.31 (m, 1H), 2.05-1.96 (m, 2H), 1.77-1.73 (m, 1H). 1.60-1.58 (m, 2H); ESIMS found for C14H15BrN2O3 m/z 340.0 (M+H).

Aufarbeitung

  1. temperaturewas refluxed 5 h under argon
  2. temperatureThe solution was cooled
  3. customthe excess solvent was evaporated under vacuum
  4. dissolutionThe residue was dissolved in EtOAc
  5. washwashed with dilute NaHCO3 solution (
  6. dry with materialThe organic layer was dried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe residue was purified by column chromatography (100% hexanes→5:95 EtOAc:hexanes)

Quellen und Nachweise

ORD-Eintrag
ord-a04b62ce8fda411ca55e3e4cd63f736d
Quelldatensatz
uspto-grants-2014_04
Patentnummer
US08697887B2

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