Sodium triacetoxyborohydride → [[4-(4-[[(1H-imidazol-2-ylmethyl)-(1-methyl-1H-imidazol-2-ylmethyl)-amino]-methyl]-benzylamino)-butyl]-propyl-amino]-acetic acid ethyl ester

Participants

Reaction Steps

The compound (273.0 mg) obtained in Example 84-2 was dissolved in ethanol (2.7 ml) and added with a 4 mol/l hydrogen chloride/dioxane solution (2.7 ml) and the whole was stirred at room temperature for 1 hour. Further, the solution was added with a 4 mol/l hydrogen chloride/dioxane solution (1.0 ml) and the whole was stirred at room temperature for 30 minutes. After completion of the reaction, the solvent was distilled off, thereby obtaining a crude product (350.0 mg) of [(4-amino-butyl)-propyl-amino]-acetic acid ethyl ester as a colorless oily substance. The resultant crude product (350.0 mg) was dissolved in ethanol (4.5 ml) and added with an ethanol solution (2.6 ml) containing the compound (258 mg) obtained in Example 84-5, acetic acid (0.10 ml), and sodium triacetoxyborohydride (267.0 mg) and the whole was stirred at room temperature for 2 hours. After completion of the reaction, the solvent was distilled off. The residue was dissolved in chloroform and washed with a 1 mol/l sodium hydroxide aqueous solution, followed by extraction with chloroform. The organic layer was washed with a saturated saline solution and dried with anhydrous sodium sulfate. After filtration, the solvent was distilled off. The residue was purified through silica gel column chromatography (chloroform/methanol), thereby obtaining the subject compound (238.0 mg) as a pale-yellow oily substance.

Provenance & Evidence