Cesium carbonate → (1Z)-1-[3-(5-methyl-2-propan-2-ylphenyl)-4-oxo-1,3-thiazolidin-2-ylidene]-3-[(2R)-1-[4-[1-[4-(trifluoromethoxy)phenyl]-1,2,4-triazol-3-yl]phenyl]propan-2-yl]urea

Participants

Reaction Steps

To (R)-1-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)propan-2-amine (CB61) (0.12 g, 0.32 mmol) and sodium bicarbonate (0.10 g, 1.2 mmol) in dichloromethane/water (2:1, 3.1 mL) in an ice bath was added triphosgene (0.052 g, 0.18 mmol). The reaction was quenched with few drops of water and diluted with dichloromethane. The reaction mixture was filtered through phase separator and concentrated. The residue was dissolved in acetonitrile (2 mL) and 1-(2-isopropyl-5-methylphenyl)thiourea (0.069 g, 0.33 mmol) and cesium carbonate (0.14 g, 0.42 mmol) were added in single portions. The reaction was stirred overnight at room temperature. Additional portions of 1-(2-isopropyl-5-methylphenyl)thiourea (0.070 g, 0.33 mmol) and cesium carbonate (0.070 g, 0.21 mmol) were added and the reaction was stirred overnight. Ethanol (4 mL), methyl 2-bromoacetate (0.10 mL, 0.96 mmol), and sodium acetate (0.079 g, 0.96 mmol) were added and the reaction was heated at 60° C. for 6 hours. The reaction was cooled and stirred at room temperature over the weekend. The reaction was diluted with water and extracted with ethyl acetate (2×). The organic layers were dried with sodium sulfate, filtered, and concentrated. Purification by flash column chromatography using 0-100% ethyl acetate/B, where B=1:1 dichloromethane/hexanes, as eluent provided the title compound as a yellow oil (0.039 g, 19%).

Provenance & Evidence