2,8,9-Trimethyl-2,5,8,9-tetraaza-1-phosphabicyclo(3.3.3)undecane → butyl 2-[[(2R)-2-[2-[[4-(N-benzoylcarbamimidoyl)anilino]methyl]-1-methylbenzimidazol-5-yl]-1-oxo-1-pyrrolidin-1-ylpropan-2-yl]amino]acetate

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반응 단계

A solution of 0.3 g (0.53 mmol) of (R)-2-[4-(N-phenylcarbonylamidino)-phenylaminomethyl]-1-methyl-5-[1-(ethoxycarbonylmethylamino)-1-(pyrrolidinocarbonyl)-ethyl]-benzimidazole in 5 ml of n-butanol is mixed with 0.1 g (0.46 mmol) of 2,8,9-trimethyl-1-phospha-2,5,8,9-tetraazabicyclo[3.3.3]undecane and stirred for 1 hour at room temperature. The reaction mixture is purified on silica gel, eluting with ethyl acetate/ethanol/conc. ammonia (50:0.95:0.05 and 20:0.95:0.05). The uniform fractions are combined and concentrated by evaporation.

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