Synthesis and Metabolism of 5β-[11, 12-3H]Cholestane-3α, 7α-Diol

Abstract
5β-β11, 12-3H]Cholestane-3α, 7α-diol was synthesized as follows. 5β Cholestane-3α, 7α, 12α-triol 3, 7-diacetate was treated with phosphorus oxychloride in pyridine solution and then the product, 5β-cholest-11-ene-3α, 7α-diol diacetate, was hydrogenated in acetic acid solution using platinum oxide as a catalyst under an atmosphere of tritium gas. 5β-[11, 12-3H]Cholestane-3α, 7α-diol thus obtained was readily hydroxylated at C-26 by mitochondria in the presence of isocitric acid, magnesium chloride and potassium cyanide.