1-Hydroxybenzotriazole → 2-{(S)-2-[2-benzyloxycarbonylamino-2-(4-methoxy-3-methyl-phenyl)-acetylamino]-3-phenyl-propionylamino}-thiazole-4-carboxylic acid methyl ester

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반응 단계

To a solution of 2-((S)-2-amino-3-phenyl-propionylamino)-thiazole-4-carboxylic acid methyl ester (0.93 g, 3.04 mmol), benzyloxycarbonylamino-(4-methoxy-3-methyl-phenyl)-acetic acid (1.0 g, 3.04 mmol), diisopropylethylamine (2.1 mL, 12 mmol) and 1-hydroxybenzotriazole (0.46 g, 3.04 mmol) in N,N-dimethylformamide (10 mL) at 0° C. was added O-benzotriazol-1-yl-N,N, N′,N′-tetramethyluronium hexaflurorophosphate (1.15 g, 3.04 mmol). The reaction mixture was stirred at 0° C. for 2 hours. The reaction mixture was poured into ice water and extracted with ethyl acetate. The organic layer was separated, washed with water, brine, dried over sodium sulfate and concentrated. The residue was purified by chromatography over silica gel eluted with 2:1 ethyl acetate/hexanes to give 2-{(S)-2-[2-benzyloxycarbonylamino-2-(4-methoxy-3-methyl-phenyl)-acetylamino]-3-phenyl-propionylamino}-thiazole-4-carboxylic acid methyl ester as a white solid (1.3 g, 69%).

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