Water → 4-Amino-5-chloro-2-(2-propenyloxy)benzoic acid

Participants

Reaction Steps

A suspension of 60% sodium hydride/oil dispersion (1.52 g, 38 mmol) in anhydrous dimethylformamide (50 mL) under nitrogen was treated in portions with 4-amino-5-chloro-2-hydroxybenzoic acid methyl ester (6.05 g, 30 mmol), stirred at room temperature for 30 minutes, and treated with allyl bromide (4.60 ,g 38 mmol). The mixture was stirred at 95±5° C. for one hour, cooled to room temperature, and added to water (250 mL). The solid was removed by filtration and saved, and the filtrate was extracted with ether (2×100 mL). The concentrated ethereal extracts were combined with the filtrated solid, taken up in 20% aqueous ethanol (100 mL), treated with potassium hydroxide (10 g), and refluxed for 45 minutes. The ethanol was removed in vacuo and the aqueous solution was extracted with ether (50 mL) and petroleum ethers (30°-60°, 50 mL), cooled (0° C.), and acidified to pH 4 with concentrated hydrochloric acid (17 mL).

Provenance & Evidence