title: Synthesis of deuterium-labeled 16 alpha,19-dihydroxy C19 steroids as internal standards for gas chromatography-mass spectrometry.
abstract: [2 beta,7,7,16 beta-2H4]16 alpha,19-Dihydroxyandrost-4-ene-3,17-dione (14) and [7,7,16 beta-2H3]3 beta,16 alpha,19-trihydroxyandrost-5-en-17-one (16), with high isotopic purity, respectively, were synthesized from unlabeled 3 beta-(tert-butyldimethylsiloxy)-androst-5-ene-17 beta-yl acetate (1). The deuterium introduction at C-7 was carried out by reductive deoxygenation of the 7-keto compound 3 with dichloroaluminum deuteride and that at C-2 beta and/or C-16 beta by controlled alkaline hydrolysis of 16-bromo-17-ketone 11 or 12 with NaOD in D2O and pyridine. [7,7-2H2]3 beta-Hydroxyandrost-5-en-17-one (6), obtained from compound 1 by a five-step sequence, was converted to compound 14 or 16 by an eight-step or seven-step sequence, respectively. The labeled steroids 14 and 16 are useful as internal standards for gas chromatography-mass spectrometry analysis of the endogenous levels.
authors: Tohoku College of Pharmacy, Sendai, Japan.
authors: M
authors: M
authors: Numazawa
authors: S
authors: S
authors: Satoh
authors: Y
authors: Y
authors: Osawa
mesh_terms: D000735:Androstenedione / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000592:standards; D003903:Deuterium; D008401:Gas Chromatography-Mass Spectrometry / Q000592:standards
chemical_list: D000735:Androstenedione; D003903:Deuterium