Phosphorus pentachloride → HCID 11723984, compound

A mixture of 5-(2,4-difluorophenoxy)-2-methyl-4-nitrobenzoic acid (1.4 g) and phosphorus pentachloride (1 g) in benzene (10 ml) was stirred for 1 hour at room temperature. The mixture was concentrated under reduced pressure to give an oil of 5-(2,4-difluorophenoxy)-2-methyl-4-nitrobenzoyl chloride (1.6 g). A solution of diethyl malonate (0.88 g) and ethanol (0.5 ml) in ether (5 ml) was added dropwise to a stirred solution of magnesium (132 mg), ethanol (0.2 ml), and carbon tetrachloride (0.3 ml) in ether (5 ml) at room temperature. The mixture was stirred for 1 hour at room temperature and refluxed for 30 minutes. To the resulting mixture was added dropwise a solution of 5-(2,4-difluorophenoxy)-2-methyl-4-nitrobenzoyl chloride (1.6 g) in ether (3 ml) at 5° C. The mixture was stirred for 2 hours at room temperature and refluxed for 1 hour. The reaction mixture was poured into 10% sulfuric acid (40 ml) and extracted with ethyl acetate. The extract was washed with water, dried, and concentrated to give an oil of diethyl 5-(2,4-difluorophenoxy)-2-methyl-4-nitrobenzoylmalonate (2.1 g).

1. concentrationThe mixture was concentrated under reduced pressure

ORD record

ord-7aac3c49613447f88756fd244ffe4d6e

Source dataset

uspto-grants-1989_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04866091