81900-93-8,With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.81900-93-8,4-Aminobenzo[d]oxazol-2(3H)-one,as a common compound, the synthetic route is as follows.
Commercially available 4-fluoro-2-trifluoromethylbenzylamine (0.5 ml, 3.7 mmol) was dissolved in 20 ml of AcOEt and at 0C triphosgene (1.12 g, 3.7 mmol) was added to the solution. The mixture was warmed at 80C for 4 hours then evaporated and the residue was dissolved in 5ml of DMF. The solution of the isocyanate was added dropwise to a solution in DMF (5ml) of compound lb (360 mg, 2.4 mmol) and the mixture was warmed at 80C for 8 hours. (TLC AcOEt 4 / petroleum ether 6). The solvent was evaporated and the crude was dissolved in AcOEt (30ml) and washed with water (1 X 20 ml) and brine. The organic phase was dried over sodium sulfate and concentrated under vacuum. The purification of the crude residue by chromatographic column gave 90 mg of a white solid. Yield = 10% ‘HNMR (DMSO, 200 MHz) delta 4.36 (2H, d, J = 5.6 Hz), 6.71 (1H, t, J = 6 Hz), 6.98 (2H, m), 7.56 (4H, m), 8.55 (1H, bs), 1 1.09 (1H, bs); [M+1] 370.2 (C16HnF4N3O3 requires 369.27).
As the paragraph descriping shows that 81900-93-8 is playing an increasingly important role.
Reference£º
Patent; PHARMESTE S.R.L.; NAPOLETANO, Mauro; TREVISANI, Marcello; PAVANI, Maria Giovanna; FRUTTAROLO, Francesca; WO2011/120604; (2011); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem