88247-74-9Relevant articles and documents
Synthesis of Cholesterol and Derivatives substituted in the Side chain
Kirk, David N.,Varley, Michael J.,Makin, Hugh L.J.,Trafford, David J.H.
, p. 2563 - 2567 (2007/10/02)
The carbanion derived from 24-phenylsulphonylchol-5-en-3β-ol 3-tetrahydropyranyl ether (6) reacted with acetone to give the 24-phenylsulphonyl-25-hydroxycholesterol derivative (7a), which was reduced by sodium amalgam to a separable mixture of the labelled 25-hydroxycholesterol and cholest-5,24-dien-3β-ol (desmosterol) derivatives. Cholesterol has been obtained via a selective reduction of the Δ24-unsaturation in desmosteryl benzoate with di-imide, or more efficiently by reducing 25-hydroxycholesteryl 3,25-diacetate w ith litium in ethylamine, without significant loss of label.The labelled 24,25-dihydroxycholesterols were also prepared from desmosteryl benzoate.
