Reaction Steps
Synthesis of N-methyl-4-{[3-(trifluoromethyl)-4-cyanophenyl]-2,4-dioxo-tetrahydropyrimidin-1(2H)-yl}benzamide 1.3.2(1), (X═O, R1=CH3). Ethyl acrylate (8 g, 80 mmol) and DBU (0.81 g, 5.4 mmol) were added to a solution of 4-amino-N-methyl-2-fluorobenzamide (9 g, 53.6 mmol) in DMSO (90 ml) and stirring was continued for 24 h at 70° C. (LCMS control). The reaction mixture was subjected to lyophilization, the residue was recrystallized from aqueous alcohol. It gave ethyl N-[4-(methylcarbamoyl)-3-fluorophenyl]-β-alaninate 5. LCMS (M+H)+ 269. 1H NMR (DMSO-d6, 400 MHz) δ 7.57 (br. s, 1H), 7.48 (t, J=8.8 Hz, 1H), 6.47 (br. s, 1H), 6.42 (d, J=8.8 Hz, 1H), 6.33 (d, J=14.8 Hz, 1H), 4.07 (q, J=7.2 Hz, 2H), 3.32 (br. m, 2H), 2.73 (d, J=4.4 Hz, 3H), 2.55 (t, J=6.4 Hz, 2H), 1.18 (t, J=7.2 Hz, 3H). The solution of 4-isocyanato-2-(trifluoromethyl)benzonitrile (425 mg, 1.87 mmol) 3.1 and ethyl N-[4-(methylcarbamoyl)-3-fluorophenyl]-β-alaninate (500 mg, 1.87 mmol) 5 (R1=CH3) in CH2Cl2 (10 ml) was stirred for 5 h. The reaction mixture was evaporated in vacuo, and the product was isolated by colomn chromatography on SiO2 (eluent—n-hexane:AcOEt:Et3N=1:1:0.03). It gave ethyl N-[4-(methylcabamoyl)-3-fluorophenyl]-N-{[3-(trifluoromethyl)-4-cyanophenyl]-carbamoyl}-β-alaninate 6(1) (R1=CH3, X═O). LCMS (M+H)+ 481. HCl (2.5 ml) was added to the solution of ethyl N-[4-(methylcabamoyl)-3-fluorophenyl]-N-{[3-(trifluoromethyl)-4-cyanophenyl]-carbamoyl}-β-alaninate (500 mg, 1.04 mmol) 6(1) in AcOH (5 ml) and the resultant mixture was stirred for 15 h. The reaction mixture was poured into water, the product was extracted with EtOAc. Organic layer was dried over Na2SO4, evaporated in vacuo and by means of colomn chromatography on SiO2 (eluent—n-hexane:AcOEt=1:1) N-methyl-4-{[3-(trifluoromethyl)-4-cyanophenyl]-2,4-dioxo-tetrahydropyrimidin-1(2H)-yl}benzamide 1.3.2, (X═O, R1=CH3) was isolated; Ki1.3.2(1)=85.6 nM, LCMS (M+H)+ 435. 1H NMR (DMSO-d6, 400 MHz): δ 8.29 (d, J=7.6 Hz, 1H), 8.23 (br. m, 1H), 8.11 (s, 1H), 7.89 (d, J=2.0 Hz, 1H), 7.67 (t, J=8.4 Hz, 1H), 7.39 (d, J=12.4 Hz, 1H), 7.33 (d, J=8.4 Hz, 1H), 4.02 (t, J=6.4 Hz, 2H), 3.03 (t, J=6.4 Hz, 2H), 2.77 (d, J=4.4 Hz, 3H).
