2-Nitroanisole → 7-methoxy-2-methyl-1H-indole
Reaktionsgleichung
[C:1]([Mg]Br)([CH3:3])=[CH2:2].[CH3:6][O:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[N+:14]([O-])=O.[NH4+].[Cl-]>C1COCC1>[CH3:6][O:7][C:8]1[CH:13]=[CH:12][CH:11]=[C:10]2[C:9]=1[NH:14][C:1]([CH3:3])=[CH:2]2Komponenten
5
Edukt 3
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
800 ml of a 0.5M solution of isopropenylmagnesium bromide in THF is cooled to −40° C. under a nitrogen atmosphere, a solution of 20.4 g of 2-methoxynitrobenzene in 125 ml of THF is then added dropwise and the mixture is left stirring for 1 hour while allowing the temperature to return to 0° C. The reaction mixture is poured into a saturated NH4Cl solution and extracted with ether, the organic phase is washed with a saturated NaCl solution and dried over MgSO4, and the solvent is evaporated under vacuum. The residue is chromatographed on silica gel, elution being carried out with cyclohexane and then with a cyclohexane/EtOAc mixture (90/10; v/v). 2.45 g of the expected compound are obtained in the form of an oil.