反应详情

Into a nitrogen-purged round bottom flask was charged 5.53 grams (0.03 mole) of 2-methyl-4,5-dichloroaniline, 3.18 grams (0.03 mole) of triethylamine and 190 milliliters of tetrahydrofuran solvent. With vigorous stirring, a 5.55 gram (0.03 mole) portion of ethyl 1-chlorocarbonylcyclopropanecarboxylate prepared in Example XVIII was added in one portion, after which the mixture was stirred at ambient temperature for a six-hour period. A precipitate of triethylamine hydrochloride was then filtered off and the filtrate vacuum stripped to give a light yellow solid. The solid was taken up in ether and the solution water-washed, dried over magnesium sulfate, and solvent evaporated to give a yellow powder. Recrystallization from ethyl acetate-hexane gave 4.51 grams (0.01 mole) of ethyl 1-(2-methyl-4,5-dichlorophenylaminocarbonyl)cyclopropanecarboxylate having a melting point of 105° C.-107° C. Elemental analysis of the product indicated the following:

1. customInto a nitrogen-purged round bottom flask
2. filtrationA precipitate of triethylamine hydrochloride was then filtered off
3. customto give a light yellow solid
4. washthe solution water-washed
5. dry with materialdried over magnesium sulfate, and solvent
6. customevaporated
7. customto give a yellow powder
8. customRecrystallization from ethyl acetate-hexane