Réaction #1994293

Équation de réaction

6-amino-5-chloro-2-(4-chloro-2-fluorophenyl)-pyrimidine-4-carboxylic acid

HCl

acetyl chloride

ethyl acetate hexane

→

title compound

Rendement 63.5%

6-Amino-5-chloro-2-(4-chloro-2-fluorophenyl)pyrimidine-4-carboxylic acid ethyl ester

Rendement 63.5%

Solvants

ethanol

ethanol

Conditions de réaction

Traitement

1. 1
   Températurecooled in an ice bath
2. 2
   ConcentrationThe reaction mixture was concentrated
3. 3
   Autrethe residue partitioned between ethyl acetate and water
4. 4
   AutreThe organic phase was dried
5. 5
   Concentrationconcentrated
6. 6
   Autrethe product was purified by column chromatography (dichloromethane/ethyl acetate gradient)

Mode opératoire

A 1N solution of HCl in ethanol was generated by adding 0.565 mL of acetyl chloride dropwise to 12 mL of ethanol cooled in an ice bath. This solution was added to 200 mg of 6-amino-5-chloro-2-(4-chloro-2-fluorophenyl)-pyrimidine-4-carboxylic acid and the resulting solution was heated at 62° C. overnight. The reaction mixture was concentrated and the residue partitioned between ethyl acetate and water. The organic phase was dried and concentrated, and the product was purified by column chromatography (dichloromethane/ethyl acetate gradient). A second chromatography utilizing an amine-functionalized silica gel column (Biotage KP-NH) and an ethyl acetate/hexane gradient solvent system yielded the title compound (139 mg, 63.5% yield): mp 131-132° C.: 1H NMR (CDCl3): δ 7.97 (m, 1H), 7.2 (m, 2H), 5.63 (br s, 2H), 4.48 (q, 2H), 1.44 (t, 3H).

Source