反应详情

In to a stirred solution containing 10.0 grams (0.06 mole) of 4-chloro-2-methoxyaniline and 6.42 grams (0.06 mole) of triethylamine in 200 milliliters of tetrahydrofuran was added 7.65 grams (0.06 mole) of trimethylacetyl chloride in a small amount of tetrahydrofuran solvent. The resulting mixture was stirred for two hours at room temperature. Triethylamine hydrochloride precipitated and was filtered off and the filtrate vacuum stripped to give a dark liquid which was taken up in methylene chloride. This solution was washed with 2N HCl (2×100 milliliters), then with water (1×100 milliliters), dried over magnesium sulfate and solvent evaporated to give a crude product which was crystallized from hexane to give 6.82 grams (0.03 mole) of 2,2-dimethyl-N-(4-chloro-2-methoxyphenyl)propanamide as a first and second crop. NMR analysis of the product indicated the following:

1. customTriethylamine hydrochloride precipitated
2. filtrationwas filtered off
3. customto give a dark liquid which
4. washThis solution was washed with 2N HCl (2×100 milliliters)
5. dry with materialwith water (1×100 milliliters), dried over magnesium sulfate and solvent
6. customevaporated
7. customto give a crude product which
8. customwas crystallized from hexane