Potassium Carbonate → Trityllosartan

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-(4'-bromomethyl-1,1'-biphenyl-2-yl)-2-triphenylmethyl-2H-tetrazole (0.102 m=63.1 g), 2-n-butyl-4-chloro-1H-imidazole-5-carboxaldehyde (0.113 m=21.1) and anhydrous potassium carbonate (0.135 m=18.6 g) in 251 g of N,N-dimethylacetamide was stirred at 0°-5° C. for 8 hours and the temperature of the reaction was raised to 25° C. for an additional 4 hours. Normally the product of this step was not isolated but reduced with sodium borohydride to give 2-n-butyl-4-chloro-1-[(2'-(2-triphenylmethyl-2H-tetrazol-5-yl) -1,1'-biphenyl-4-yl)methyl]-1H-imidazole-5-methanol. The title compound can be isolated by extraction into toluene from aqueous N,N-dimethylacetamide, concentration of the toluene solution, and crystallization from ethyl acetate or ethanol, mp 145°-147° C. (dec.)

Provenance & Evidence