In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 36692-49-6, name is Methyl 3,4-diaminobenzoate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. 36692-49-6
Step 450b. The mixture of (S)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid (5 g, 23.2 mmol) in acetonitrile (40 mL) was added 1,1?-carbonyldiimidazole (3.95 g, 24.5 mmol). The resulting mixture was stirred at room temperature for 20 min before being added methyl 3,4-diaminobenzoate (3.86g, 23.2 mmol). The solution was stirred at room temperature for another 3 hours before being partitioned between water and EtOAc. The organic phase was separated, dried (Na2SO4) and concentrated to afford a brown slurry, which was purified by flash column chromatography (silica, hexane-EtOAc) to give the desired product as a light yellow oil (8.14g, 98%). ESIMS m/z=364.17 [M+H]+. ; Step 450c. The solution of compound from step 450b in acetic acid (150 mL) was stirred at 60 C. for three days before all volatiles were removed. The resulting residue was partitioned between aqueous NaHCO3 and EtOAc. The organic phase was separated, dried (Na2SO4) and concentrated to afford a brown oil, which was purified by flash column chromatography (silica, hexane-EtOAc) to give the desired product as a light yellow solid (2.02 g, 28%). ESIMS m/z=346.15 [M+H]+.
The synthetic route of 36692-49-6 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Enanta Pharmaceuticals, Inc.; Qiu, Yao-Ling; Wang, Ce; Peng, Xiaowen; Ying, Lu; Or, Yat Sun; US2020/2314; (2020); A1;,
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