1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 69592241, compound

Participants

Reaction Steps

To a solution of 251 mg (1.0 mmol) of (5Z)-7-[(1R,2S,3S,4S)-3-aminobicyclo[2.2.1]hept-2-yl]-5-heptenoic acid methyl ester (1) in 4 ml of tetrahydrofuran were added 257 mg (1.0 mmol) of 5 -(pyrrol-1-ylsulfonyl)thiophen-2-carboxylic acid and 13.5 mg (0.1 mmol) of 1-hydroxybenzotriazole. Under ice-cooling, 186 mg (1.2 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide was added thereto. The mixture was warmed to room temperature and stirred at 25° C. for 16 h. The mixture was diluted with water and extracted with toluene. The organic layer was washed with dilute hydrochloric acid and water, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was chromatographed on silica gel (toluene/ethyl acetate=6:1) to give 412 mg of (5Z)-7-{(1R,2S,3S,4S)-3-[5-(pyrrol-1-ylsulfonyl)-thiophen-2-ylcarbonylamino]-bicyclo[2.2.1]hept-2-yl}-5-heptenoic acid methyl ester (I-la). Yield 83.9%.

Provenance & Evidence