S-Tritylcysteamine → 5-{3-[(1S)-2-Methoxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]phenyl}-N-[2-(tritylthio)ethyl]-1H-pyrrole-2-carboxamide

Participants

Reaction Steps

To 5-{3-[(1S)-2-methoxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]phenyl}-1H-pyrrole-2-carboxylic acid (940 mg, 2.1 mmol) synthesized in Example (18a), 2-(tritylthio)ethaneamine (1.01 g, 3.17 mmol) synthesized in Example (25a) and 4-dimethylaminopyridine (13 mg, 0.1 mmol) were added, followed by dissolution in dichloromethane (50 mL), and subsequently WSCI•HCl (445 mg, 2.3 mmol) was added at room temperature, and stirring was carried out for 1 hour under nitrogen atmosphere. The reaction solution was diluted with dichloromethane (150 mL), washed with 1N hydrochloric acid, a saturated aqueous sodium hydrogencarbonate solution and saturated brine, and subsequently dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified using silica gel column chromatography (elution solvent: ethyl acetate/hexane=10%-55%) to afford the desired product (1.08 g, yield 69%) as a white solid.

Provenance & Evidence