(3β)-24-Bromo-3-[(tert-butyl)dimethylsilyloxy]-chol-5-ene is a reactant used in the preparation of series of cholesterol side-chain analogs used in studies of the ω-regiospecificity of Mycobacterium tuberculosis cholesterol metabolizing cytochrome P 450 enzymes CYP124A1, CYP125A1 and CYP142A1.