Dichloromethane → n1-[2-chloro-5-(trifluoromethyl)phenyl]-2,2-dichloroacetamide

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Reaction Steps

The intermediate N-[2'-chloro-5'-trifluoromethylphenyl]-3-chloro-4-chloromethyl-2-pyrrolidinone is prepared as follows: 50 g of 2-chloro-5-trifluoromethylaniline is combined with 34.8 g of triethylamine (TEA) and 200 ml of CH2Cl2. 48.6 g of dichloroacetyl chloride (DCAC) added dropwise while the mixture was kept at about 10° C. The mixture was stirred overnight forming a precipitate. The mixture was brought up to 1800 ml with CH2Cl2 and was washed 3 times (×) with 300 ml water, 3×300 ml 1.0N HCL and 3×300 ml saturated NaHCO3. The precipitate was dried over night with magnesium sulfate (MgSO4) and stripped, yielding 59 g of 2'-chloro-5'-trifluoromethyldichloroacetanilide. 58.3 g of the 2'-chloro-5'-trifluoromethyldichloroacetanilide and 37.2 g of potassium carbonate (K2CO3) were combined with 300 ml acetone and heated with stirring to reflux in a 2 liter flask equipped with a thermal reflux condenser, drop funnel and N2 bubbler. 39.1 g allyl bromide was added via the drop funnel at a constant temperature at 60° C. The mixture was refluxed for 2 hours and then stirred overnight. The mixture was filtered and stripped. 200 ml CH2Cl2 was added to the residue. This mixture was washed 3× with 100 ml H2O and 2× with 100 saturated NaCl solution. The filtrate was dried overnight in MgSO4 and stripped to yield 55 g of N-allyl-2'-chloro-5'-trifluoromethyldichloroacetanilide.

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