Pyridine → (R)-[4-(3-cyano-1-cyclobutyl-6-methanesulfonylmethoxy-1H-indol-2-yl)-phenyl]-carbamic acid 1-cyclopropyl-ethyl ester

Participants

Reaction Steps

2-(4-Amino-phenyl)-1-cyclobutyl-6-methanesulfonylmethoxy-1H-indole-3-carbonitrile (100 mg, 0.25 mmol) was combined with p-nitrophenyl chloroformate (120 mg, 0.6 mmol), DCE (1 mL), and pyridine (60 μL, 0.75 mmol) and stirred at room temperature for 1 h. To this mixture was added (R)-1-Cyclopropylethanol (90 μL, 0.92 mmol) and then heated at 80° C. for 2 h. The reaction mixture was diluted with CH2Cl2 and washed with dilute aqueous NaOH solution. The organic layer was dried, concentrated and purified by silica gel chromatography (95:5 CH2Cl2/EtOAc) to provide (R)-[4-(3-cyano-1-cyclobutyl-6-methanesulfonylmethoxy-1H-indol-2-yl)-phenyl]-carbamic acid 1-cyclopropyl-ethyl ester (105 mg, 83%) as a white solid.

Provenance & Evidence