反应详情

4-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholin-4-ium chloride (=DMTMM, see Tetrahedron 1999, 55, 13159-13170) (1.25 g, 4.51 mmol, 1.1 eq.) was added to 1-methyl-3-(pentafluoroethyl)-4-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid (1.28 g, 4.1 mmol; preparation according to WO2010/051926) and tert-butyl (5-amino-2-chlorobenzyl)carbamate (1.05 g, 4.1 mmol, 1.0 eq.) in THF (15 ml), and the mixture was left at room temperature for 18 h. Water (30 ml) was added, the mixture was extracted with ethyl acetate (3×30 ml) and the extracts were dried over MgSO4. After concentration under reduced pressure, the product was purified by column chromatography on silica gel (hexane/ethyl acetate), giving tert-butyl [2-chloro-5-({[1-methyl-3-(pentafluoroethyl)-4-(trifluoromethyl)-1H-pyrazol-5-yl]carbonyl}amino)benzyl]carbamate (924 mg, 41%).

1. extractionthe mixture was extracted with ethyl acetate (3×30 ml)
2. dry with materialthe extracts were dried over MgSO4
3. concentrationAfter concentration under reduced pressure
4. customthe product was purified by column chromatography on silica gel (hexane/ethyl acetate)