Ethyl chloroformate → HCID 19832672, compound

Participants

Reaction Conditions

Reaction Steps

55.6 g of N-methoxy-N-methyl-5-amino-2-chloro-4-fluorobenzamide are dissolved in 200 ml of pyridine and the solution is cooled to 0° C. 30.4 g of ethyl chloroformate are added dropwise at 0° C. while stirring and thereafter the reaction mixture is stirred for 14 hours. The mixture is poured into 1 liter of ice-water, the aqueous mixture is extracted three times with 250 ml of ethyl acetate each time, the combined organic phases are washed to neutrality, dried over anhydrous sodium sulphate and the solvent is evaporated off. The product is crystallized from diethyl ether. In this manner there is obtained ethyl 4-chloro-2-fluoro-5-(N-methoxy-N-methylcarbamoyl)-carbanilate, m.p. 121° C., used as the starting material in Example 1.

Provenance & Evidence