With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.84594-78-5,6-Nitro-2,3-dihydrobenzofuran-5-amine,as a common compound, the synthetic route is as follows.
84594-78-5, Preparation of 6-nitro-2,3-dihydrobenzofuran Into a 2000 mL 3-necked round-bottom flask, was placed a solution of 6-nitro-2,3-dihydrobenzofuran-5-amine (57 g, 300.83 mmol, 1.00 equiv, 95%) in H20 (1000 mL). To the mixture was added con H2SO4 (570 mL). To the above was added NaNO2 (24 g, 347.83 mmol, 1.10 equiv) in several batches, while cooling to a temperature of 0 C. To the above was added phosphenous acid (114 mL, 50%) dropwise with stirring, while cooling to a temperature of 0 C. The resulting solution was allowed to react, with stirring, for 1 h while the temperature was maintained at 45 C. in a bath of oil. The reaction progress was monitored by TLC (EtOAc/PE=1:2). The resulting solution was extracted two times with 200 mL of EtOAc and the organic layers combined. The resulting mixture was washed 2 times with 150 mL of water. The mixture was dried over Na2SO4 and concentrated by evaporation under vacuum using a rotary evaporator. The residue was purified by eluding through a column with a 1:50 EtOAc/PE solvent system. This resulted in 42 g (76%) of 6-nitro-2,3-dihydrobenzofuran as a red yellow solid.
As the paragraph descriping shows that 84594-78-5 is playing an increasingly important role.
Reference£º
Patent; MEMORY PHARMACEUTICALS CORPORATION; US2008/200471; (2008); A1;,
Benzofuran – Wikipedia
Benzofuran | C8H6O – PubChem