1,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride → {(R)-[4-(2-Morpholin-4-yl-ethoxy)-phenyl]-[(1S,2S)-2-phenyl-1-(4-propionyl-thiazol-2-ylcarbamoyl)-propylcarbamoyl]-methyl}-carbamic acid-tert-butyl ester

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Reaction Steps

(R)-tert-butoxycarbonylamino-[4-(2-morpholin-4-yl-ethoxy)-phenyl]-acetic acid (≈2.93 mmol) was dissolved in tetrahydrofuran (60 mL) and (2S,3S)-2-amino-3-phenyl-N-(4-propionyl-thiazol-2-yl)-butyramide (500 mg, 1.58 mmol) (prepared as described in example 4) was added followed by 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (600 mg, 3.12 mmol) at 0° C. The reaction mixture was allowed to slowly warm to room temperature. After stirring for 5.5 hours the reaction mixture was partitioned between ethyl acetate and brine, the organic extract was dried over sodium sulfate and concentrated in vacuo. The resulting residue purified by chromatography over silica gel eluted first with ethyl acetate and then gradient eluted with dichloromethane containing from 0 to 10% methanol. {(R)-[4-(2-Morpholin-4-yl-ethoxy)-phenyl]-[(1S,2S)-2-phenyl-1-(4-propionyl-thiazol-2-ylcarbamoyl)-propylcarbamoyl]-methyl}-carbamic acid-tert-butyl ester was obtained as a white solid (146 mg, 14%).

Provenance & Evidence