Hydrochloric Acid → HCID 14135842, compound

Participants

Reaction Steps

The 3,6-dioxo-5α sterol was prepared by acid-catalyzed isomerization of the 5β sterol. To methanol (250 ml) was added the 3,6-dioxo-5β sterol 1017 (9.6 g, 24 mmol) and tetrahydrofuran (25 ml) to dissolve the sterol completely. Concentrated hydrochloric acid (12.5 ml) was added, and the reaction was allowed to proceed overnight. The solvent was then removed under vacuum to yield 9.6 g (100% yield) of methyl 3,6-dioxo-5α-cholan-24-oate 1018 (see Organic Preparations and Procedures Int. 19(2-3), 1987, 197-208; authors used base-catalyzed isomerization using sodium methoxide rather than HCl).

Provenance & Evidence