Methyl bromoacetate → (1Z)-1-[3-(2-butan-2-ylphenyl)-4-oxo-1,3-thiazolidin-2-ylidene]-3-[4-[1-[4-(trifluoromethoxy)phenyl]-1,2,4-triazol-3-yl]phenyl]urea

Participants

Reaction Steps

To a solution of 1-(2-(sec-butyl)phenylthiourea (1.40 g, 6.72 mmol) suspended in 5 mL of acetone was added methyl bromoacetate (1.23 g, 1.20 mmol), and the solution was allowed to stir at ambient temperature for 18 h. The solution was then diluted with 8 mL of diethyl ether and, after stirring for 30 min, the solvent was carefully decanted from a gummy oil. The intermediate, methyl 2-((N-(2-(sec-butyl)phenyl)carbamimidoyl)thio)acetate HBr (B8), was dissolved in 8 mL of dry tetrahydrofuran and 4-nitrophenyl(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)carbamate (3.26 g, 6.72 mmol) was added, followed by Hünig's base (2.6 g, 20 mmol). The solution was allowed to stir at ambient temperature for 3 h, then it was concentrated and the residue chromatographed (silica gel, 0-70% EtOAc-hexanes) to give 730 mg (18%) of the title compound as a solid, mp 169-177° C.; 1H NMR (400 MHz, CDCl3) δ 8.53 (s, 1H), 8.12 (d, J=8.7 Hz, 2H), 7.81-7.74 (m, 2H), 7.63-7.56 (m, 2H), 7.52 (m, 1H), 7.45 (d, J=7.9 Hz, 1H), 7.41-7.32 (m, 3H), 7.28 (s, 1H), 7.11 (d, J=7.9 Hz, 1H), 4.03-3.95 (m, 2H), 2.43 (dd, J=13.5, 6.8 Hz, 1H), 1.73-1.56 (m, 2H), 1.20 (overlapping d, J=7.6 Hz, 3H), 0.78 (overlapping t, J=7.4 Hz, 3H); ESIMS m/z 594 ([M+H]+).

Provenance & Evidence