反应详情

To a stirred, cooled (-20° C) solution of 3,3,3-trifluoro-2-hydroxy-2-methylpropanoic acid (1.02 g, 6.4 mmol) in N,N-dimethylacetamide (10 mL) was added thionyl chloride (0.77 g, 6.4 mmol) and the mixture stirred at -10° to -15° C. for 1 hour. 4'-Amino-2,3-difluorobenzophenone (1.00 g, 4.3 mmol) was added in one portion and the reaction mixture stirred at room temperature overnight. The mixture was poured into water and the aqueous solution extracted with methylene chloride (2×50 mL). The combined organics were washed with water and 3N HCl (1×50 mL), dried (MgSO4) and concentrated in vacuo to yield a tan solid. The solid was purified by flash column chromatography (5% v/v ethyl acetate/methylene chloride). Recrystallization of the resulting solid from methylene chloride/hexane yielded the title propanamide as a white solid (1.13 g, 70%); mp 154°-155° C. 1H-NMR (250 MHz, d6-DMSO): 1.60 (s, 3H, CH3) 7.36-7.40 (m, 2H, aromatic) 7.57 (s, 1H, OH) 7.65-7.72 (m, 1H, aromatic) 7.89 (d, 2H, J=8.6 Hz, aromatic) 7.98 (d, 2H, J=8.6 Hz, aromatic) 10.40 (s, 1H, NH). MS (CI, CH4): 374 (M+1).

1. stirringthe reaction mixture stirred at room temperature overnight
2. extractionthe aqueous solution extracted with methylene chloride (2×50 mL)
3. washThe combined organics were washed with water and 3N HCl (1×50 mL)
4. dry with materialdried (MgSO4)
5. concentrationconcentrated in vacuo
6. customto yield a tan solid
7. customThe solid was purified by flash column chromatography (5% v/v ethyl acetate/methylene chloride)
8. customRecrystallization of the resulting solid from methylene chloride/hexane