As a common heterocyclic compound, it belongs to benzoxazole compound, name is 5-Nitro-2,3-dihydro-1,3-benzoxazol-2-one, and cas is 3889-13-2, its synthesis route is as follows.
A solution of 5-nitro-3H-benzooxazol-2-one (26 g) in DMF (100 mL) was added to a suspension of NaH (60% in mineral oil, 10.71 g) in DMF (100 mL) over a period of 1 hour. Stirring was continued for 45 minutes at r.t. The mixture was cooled to 0 C. and methyl iodide dissolved in DMF (20 mL) was added dropwise over a period of 30 minutes. The mixture was stirred over night at r.t. The reaction mixture was poured into ice/water and extracted two times with ethyl acetate. The combined organic layers were washed with brine, dried over Na2SO4, filtered and the solvent was evaporated. CH2Cl2_methanol=4:1 (150 mL) was added to the resulting precipitate and the suspension was stirred for 1 hour at r.t. The solid was filtered off and dried in vacuo. The title compound was obtained as a orange solid (18.33 g, 62%). MS (EI)=194.0 [M+].
3889-13-2, In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles.,3889-13-2 ,5-Nitro-2,3-dihydro-1,3-benzoxazol-2-one, other downstream synthetic routes, hurry up and to see
Reference：
Patent; Hunziker, Daniel; Lerner, Christian; Mueller, Werner; Sander, Ulrike Obst; Pflieger, Philippe; Waldmeier, Pius; US2010/249124; (2010); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem