反应详情

N-[{1-[(2-Chlorophenyl)methyl]-2-n-butyl-1H-imidazol-5-yl}methyl]phenylalanine methyl ester (prepared in Example 3(i) method B) (o.52 g, 1.18 mmol), 88% formic acid (0.31 g), and 37% aqueous formaldehyde (o.44 g) were heated over a steam bath for 18 hours. The reaction mixture was poured into 10% hydrochloric acid solution and then extracted with diethyl ether. The aqueous layer was basified to pH 10 with 10% sodium hydroxide solution and then the product was extracted into ethyl acetate. The organic extract was dried with anhydrous magnesium sulfate and the solvent was removed in vacuo. The crude product was chromatographed on silica gel with 50% ethyl acetate in hexane to give 0.377 g (70%) of N-[{1-[(2-chlorophenyl)methyl]-2-n-butyl-1H-imidazol -5-yl}methyl]-N-methylphenylalanine methyl ester. Hydrolysis of the ester following the procedure of Example 2(ii) gave the title compound as a foam (0.265 g, 77%); mp 59°-61° C.

1. extractionextracted with diethyl ether
2. extractionthe product was extracted into ethyl acetate
3. extractionThe organic extract
4. dry with materialwas dried with anhydrous magnesium sulfate
5. customthe solvent was removed in vacuo
6. customThe crude product was chromatographed on silica gel with 50% ethyl acetate in hexane