Hydrochloric Acid → HCID 178440077, Verbindung

Beteiligte Stoffe

Reaktionsschritte

A solution of 1.00 g of ethyl 1-(2'-cyanobiphenyl-4-yl)methyl-4-(1-hydroxy-1-methylethyl)-2-propylimidazole-5-carboxylate [prepared as described in Example 71(b)] and 100 g of tributyltin azide in 7.5 ml of toluene was stirred at 100° C. for 5 days. 2.5 g of sodium hydrogencarbonate and 20 ml of water were then added to the mixture, and the resulting mixture was stirred at room temperature for 8 hours. At the end of this time, the mixture was diluted with ethyl acetate and acidified with 3N aqueous hydrochloric acid to a pH value of 3. The ethyl acetate layer was separated, dried over anhydrous magnesium sulfate and concentrated by evaporation under reduced pressure, to give ethyl 4-(1-hydroxy-1-methylethyl)-2-propyl-1-{4-[2-(tetrazol-5-yl)phenyl]phenyl}methylimidazole-5-carboxylate as a syrup. 0.80 g of trityl chloride was added to a solution of the whole of this syrup in 15 ml of pyridine, and the mixture was stirred at 60° C. for 4 hours. At the end of this time, the reaction mixture was concentrated by evaporation under reduced pressure, and the residue was purified by column chromatography through silica gel, using a 1:1 by volume mixture of ethyl acetate and hexane as the eluent; it was then crystallized in diisopropyl ether, to give 1.15 g of the title compound as crystals.

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