Reference of 167487-83-4, These common heterocyclic compound, 167487-83-4, name is Ethyl 1H-benzo[d]imidazole-7-carboxylate, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
Step 2: ethyl 1-(3-tert-butoxycarbonylamino-3-methyl-butyl)-1H-benzimidazole-4-carboxylate; 0.502 g (12.6 mmol) sodium hydride (60% in mineral oil) are added batchwise at 5 C. to 3.09 g (13.9 mmol) ethyl 1H-benzimidazole-4-carboxylate in 15 mL dimethylformamide and stirred for 30 minutes at ambient temperature. The reaction mixture is then combined with 1.75 g (9.20 mmol) tert-butyl (3-chloro-1,1-dimethyl-propyl)-carbamate and 0.310 g (0.840 mmol) tetraabutylammonium iodide and stirred for 24 hours at 60 C. The reaction mixture is poured into ice water and the aqueous phase is extracted with ethyl acetate. The combined organic phases are dried on sodium sulphate and concentrated by evaporation in the rotary evaporator. The residue is purified by reversed-phase flash column chromatography {Varian Microsorb C18-reverse-phase [acetonitrile (0.1% trifluoroacetic acid)/water (0.13% trifluoroacetic acid)=10:90?100:0]}, thus obtaining 0.850 g (2.26 mmol, 16%) ethyl 1-(3-tert-butoxycarbonylamino-3-methyl-butyl)-1H-benzim idazole-4-carboxylate. Rf=0.48 [silica gel, dichloromethane/methanol/ammonia (95/5/0.1)]MS [ESI (M+H)+]=376
Statistics shows that Ethyl 1H-benzo[d]imidazole-7-carboxylate is playing an increasingly important role. we look forward to future research findings about 167487-83-4.
Reference:
Patent; Trieselmann, Thomas; Walter, Rainer; Netherton, Matthew R.; Santagostino, Marco; Hamilton, Bradford S.; US2007/112033; (2007); A1;,
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