Sodium borohydride → HCID 19804291, compound

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Reaction Steps

7.6 g (0.20 mol) of sodium borohydride were added a little at a time, at 0° C., to a solution of 33.75 g (0.10 mol) of the E-1-(2-chlorophenyl)-2-(4-fluorophenyl)-3-(3-pyridyl)-2-propen-1-one, prepared under 2.), in 500 ml of methanol. Stirring was carried out for 2 hours at 0° C., excess sodium borohydride was destroyed by the dropwise addition of acetic acid and the mixture was evaporated down under reduced pressure. The residue was taken up in a water/dichloromethane mixture, and the organic phase was washed with water, dried over sodium sulfate and evaporated down under reduced pressure. Trituration with 9:1 methyl tert-butyl ether/pentane gave 27.0 g (79% of theory) of crystalline product of melting point 82°-83°C.(cf. Table, Example No. 682).

Provenance & Evidence