Methanol → HCID 178440775, compound

Participants

Reaction Steps

5-(4-Aminophenyl)-2-(4-tert-butylphenyl)-N-(2-thiazolyl)-imidazole-4-carboxamide (1.0 g) obtained in Example 77 was dissolved in tetrahydrofuran (55 ml), methanol (55 ml) and KH2PO4-Na2HPO4 buffer (pH 6.5, 70 ml), and 25% glutaraldehyde aqueous solution (1.22 g) and sodium cyanoborohydride (1.32 g) were added under ice-cooling. The mixture was stirred at room temperature for 17 days. Water (100 ml) was added and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated aqueous hydrogencarbonate solution and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was subjected to silica gel column chromatography to give the objective 2-(4-tert-butylphenyl)-5-(4-piperidinophenyl)-N-(2-thiazolyl)-imidazole-4-carboxamide (0.12 g), melting point 250-252° C. (decomposition).

Provenance & Evidence