Hydrochloric Acid → HCID 67155307, compound

Participants

Reaction Steps

The ethyl ester (1-{(S)-3-[(5-Chloro-thiophene-2-carbonyl)-amino]-2-[2-difluoromethoxy-3-(2-oxo-piperidin-1-yl)-benzenesulfonylamino]-propionyl}-piperidine-4-carboxylic acid ethyl ester) from example 9 (128 mg, 0.185 mmol) was treated with LiOH (222 μl, 0.555 mmol, 2.5 N in water) in THF/ethanol/water (2 ml, 1 ml, 0.5 ml). After 2.5 h the reaction was brought to pH=1-2 using 2 N HCl and further diluted with 30 ml water. The product crystallized from the aq layer and can be separated by filtration. Yield: 54 mg, 44%, colorless crystals.

Provenance & Evidence