Sodium borohydride → HCID 69411552, compound

Participants

Reaction Steps

4,4-Dimethyl-3-oxochol-5-en-24-oic acid methyl ester (19.8 g) (G. Aranda et al., Tetrahedron 43 (1987), 4147) is reduced with sodium borohydride (9.9 g) in 1900 ml methanol at room temperature. The solution is stirred for 20 hours. After aqueous work-up, 3β-hydroxy-4,4-dimethylchol-5-en-24-oic acid methyl ester (19.2 g) is isolated. Melting point: 136-138° C. 1H-NMR (CDCl3, 400 MHz): δ=5.55 (1H, m); 3.67 (3H, s); 3.23 (1H, m).

Provenance & Evidence