Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 26510-91-8, name is 2,4,5-Trimethoxyaniline, A new synthetic method of this compound is introduced below., Recommanded Product: 2,4,5-Trimethoxyaniline
Sodium (0.26 g, 11.5 mmol) is added in small portions to MeOH (25 mL). The solution of NaOMe is added to 4-chloro-2,5-dimethoxynitrobenzene (2.27 g, 10.4 mmol) in MeOH (50 mL) at 0 C. The reaction is refluxed for 48 h, cooled to RT and quenched with 1M citric acid (50 mL) and H2O (50 mL). The MeOH is removed under reduced pressure and the aqueous is extracted with EtOAc (3×50 mL), dried (MgSO4), and the solvent is removed. The product is purified by Biotage Flash Chromatography (40M) using 30% EtOAc:hexanes as the eluent to give starting material (1.41 g) and 2,4,5-trimethoxynitrobenzene (0.80 g, 95% based on recovered starting material) as a yellow solid. 2,4,5-Trimethoxynitrobenzene (0.44 g, 2.1 mmol) is dissolved in minimal EtOAc (5 mL) and diluted with EtOH (50 mL). 10% Pd/C catalyst is added as a slurry in EtOAc and the mixture put on the Parr apparatus in the presence of H2 (45 psi to 33 psi) for 0.5 h. The reaction mixture is filtered over celite to remove the catalyst and the solvent is removed to give 2,4,5-trimethoxyaniline (0.34 g, 86% yield) as a light pink solid. 2,4,5-Trimethoxyaniline (0.33 g, 1.8 mmol) is added dropwise as a solution in EtOAc (25 mL) to phosgene (7.6 mL, 20% in toluene) in EtOAc (50 mL). After complete addition, the reaction is heated under reflux for 0.5 h. The reaction is cooled to RT and the solvent is removed under reduced pressure to give 1-isocyanato-2,4,5-trimethoxybenzene (0.37 g, 99% yield) as a light brown solid. Example 143 is obtained using the isocyanate according to Method A making non-critical variations. Yield 44%. HRMS calcd for C13H13F3N4O4S+H 379.0688 found 379.0695.
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.