反应详情

A solution of 2-chloro-5-[(2-methyl-6-trifluoromethyl-pyridine-3-carbonyl)-amino]-benzoic acid methyl ester (6.68 g; 18 mmol) in tetrahydrofuran (100 ml) was cooled to 0° C. Lithium borohydride (0.98 g; 45 mmol) was added portionwise and the reaction mixture allowed to warm to room temperature, followed by heating at 45° C. for 4 hours. The reaction was allowed to cool to room temperature and saturated sodium bicarbonate solution (100 ml) was added. This was extracted with ethyl acetate (3×50 ml). The organic layers were dried (magnesium sulphate), filtered and evaporated. The residue was purified by column chromatography (50% ethyl acetate in heptane) to give N-(4-chloro-3-hydroxymethyl-phenyl)-2-methyl-6-trifluoromethyl-nicotinamide (3.29 g, 54%),

1. temperatureby heating at 45° C. for 4 hours
2. temperatureto cool to room temperature
3. extractionThis was extracted with ethyl acetate (3×50 ml)
4. dry with materialThe organic layers were dried (magnesium sulphate)
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by column chromatography (50% ethyl acetate in heptane)