Sodium borohydride → HCID 12251285, compound

Participants

Reaction Steps

To a partial solution of 5.10 g. (0.038 M) of 3',4'-dihydrospiro[cyclohexane-1,1'(2'H)-naphthalen]-4-one(r) (prepared as in Example 16A) in 105 ml. of 95% ethanol, 2.59 g. of sodium borohydride is added and the mixture stirred at room temperature for about 4 hours. Most of the solvent is removed under vacuum and water added to the residue. The material that precipitates is extracted with ether and the combined extracts washed with water and brine and evaporated to dryness. The residue is recrystallized once from Skellysolve B and then chromatographed over a column containing 500 ml. of silica gel with elution by 10% acetone:Skellysolve B. On the basis of TLC the less polar fractions are combined and recrystallized from benzene:cyclohexane to give a small amount of 3',4'-dihydrospiro[cyclohexane-1,1'(2'H)-naphthalen]-4-ol(s), having a melting point of 144.5° to 146° C., and an NMR spectrum suggesting that the compound has the hydroxy substituent in the axial position.

Provenance & Evidence