Methyl 2-n-butyl-3-{2'-(1-trityl-1H-tetrazol-5-yl)biphenyl-4-yl}methyl-4,5,6,7-tetrahydroimidazo[4,5-c]-pyridine-6-carboxylate 、
氯甲酰乙酸乙酯 以to give methyl 2-n-butyl-5-ethoxycarbonylacetyl-3-{2'-(1-trityl-1H-tetrazol-5-yl)biphenyl-4-yl}methyl-4,5,6,7-tetrahydroimidazo[4,5-c]pyridine-6-carboxylate的产率得到methyl 2-n-butyl-5-ethoxycarbonylacetyl-3-{2'-(1-trityl-1H-tetrazol-5-yl)biphenyl-4-yl}methyl-4,5,6,7-tetrahydroimidazo[4,5-c]pyridine-6-carboxylate