Pyridine → N-(t-butyloxycarbonyl)-4-(n-hexadecylamino)benzoyl-imidazole

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A solution of 10 g. of 4-(n-hexadecylamino)benzoic acid in 100 ml. dioxane is treated with 4.0 g. of t-butylazidoformate and 10 ml. pyridine. After stirring at room temperature for 18 hours, the protected amido-acid is precipitated from solution by addition of 150 ml. of water. The product is collected and thoroughly dried. The crude product is dissolved in 200 ml. of a mixture consisting of methylene chloride/dimethoxy ethane/pyridine (1:4:1), and to this is added 5.4 g. of 1,1'-carbonyldiimidazoye. The solution is stirred overnight at room temperature and the solvents are evaporated to yield the title compound as a thick, orange oil.

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