2,5-Dimethoxytetrahydrofuran → 2-Chloro-4-(1-pyrrolyl)benzoic acid methyl ester

Reaktionsgleichung

[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([NH2:10])=[CH:6][C:5]=1[Cl:11].CO[CH:15]1[CH2:19][CH2:18][CH:17](OC)O1>CC(O)=O.O>[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([N:10]2[CH:15]=[CH:19][CH:18]=[CH:17]2)=[CH:6][C:5]=1[Cl:11]

Komponenten

Versuchsvorschrift

A mixture of 4-amino-2-chlorobenzoic acid methyl ester (0.46 g) and 2,5-dimethoxytetrahydrofuran (0.33 mL) in AcOH (16 mL) was heated under reflux for 2 h. The mixture was cooled to room temperature, diluted with water and extracted with EtOAc. The extract was washed with satd. NaHCO3 and brine, dried (MgSO4), filtered and evaporated. The residue was purified by column chromatography (silica gel; eluent: hexane/EtOAc 5/1) to yield 0.48 g of 2-chloro-4-(1-pyrrolyl)benzoic acid methyl ester. ESMS: m/z 236 (MH+).