Pyrrole → (2-Chloro-3-nitrophenyl)-1H-pyrrol-1-ylmethanone

2-Chloro-3-nitrobenzoic acid (2 g, 10.0 mmol) and thionyl chloride (30 ml) were mixed at room temperature, and 4-dimethylaminopyridine (122 mg, 1.00 mmol) was added. The reaction mixture was refluxed for 12 hours and then concentrated to give a crude acid chloride. The acid chloride mentioned above was added to a solution of pyrrole (3.5 ml, 50.0 mmol) and triethylamine (7.0 ml, 50.0 mmol) in methylene chloride (80 ml) at room temperature. The reaction mixture was stirred at the same temperature for 6 hours and diluted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous magnesium sulfate, filtered, and concentrated to give a crude compound. The crude compound was purified by silica gel column chromatography (hexane:ethyl acetate, 1: 0–7:3) to give the title compound (2.43 g) as a yellow oil.

1. temperatureThe reaction mixture was refluxed for 12 hours
2. concentrationconcentrated
3. customto give a crude acid chloride
4. washThe organic layer was washed with brine
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customto give a crude compound
9. customThe crude compound was purified by silica gel column chromatography (hexane:ethyl acetate, 1: 0–7:3)

ORD record

ord-783ecb59287c4a8fbcb2ff861902f39d

Source dataset

uspto-grants-2006_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07148224B2