Sodium borohydride → HCID 57803051, compound

Participants

Reaction Steps

Sodium borohydride (1.42 g, 37.5 mmol) (Aldrich) was added in small portions to a solution of rac-4-(6-chloro-2-oxo-1,2-dihydro-indol-3-ylidene)-azepane-1-carboxylic acid tert-butyl ester (1.36 g, 3.75 mmol) (from Example 61a supra) in methanol (25 mL) and water (0.5 mL). After stirring at room temperature for 30 minutes, the reaction mixture was concentrated. The residue was partitioned between ethyl acetate and water. The aqueous layer was extracted with ethyl acetate three times. The combined organic layers were washed with water, brine, dried over Na2SO4 and concentrated to give rac-4-(6-chloro-2-oxo-2,3-dihydro-1H-indol-3-yl)-azepane-1-carboxylic acid tert-butyl ester as a white solid (Yield 1.37 g, 100%).

Provenance & Evidence