反应详情

206 mg of N,N-dicyclohexylcarbodiimide were added to a suspension of 464 mg of 1-[(2'-t-butoxycarbonylbiphenyl-4-yl)methyl]-2-butyl-4-hydroxymethylimidazole-5-carboxylic acid (prepared as described in Example 4) and 140 mg of N-hydroxysuccinimide in 10 ml of tetrahydrofuran, and the resulting mixture was stirred at room temperature for 16 hours. At the end of this time, the material which had precipitated was filtered off and the filtrate was concentrated by evaporation under reduced pressure. The concentrate was purified by column chromatography through silica gel, using a 1:15 by volume mixture of methanol and methylene chloride as the eluent, to afford 0.52 g of the title compound as crystals, melting at 107°-109° C.

1. customAt the end of this time, the material which had precipitated
2. filtrationwas filtered off
3. concentrationthe filtrate was concentrated by evaporation under reduced pressure
4. customThe concentrate was purified by column chromatography through silica gel
5. additionby volume mixture of methanol and methylene chloride as the eluent