title: Synthesis of (19E)-3 beta,7 alpha-dihydroxy-17-oxoandrost-5-en-19-al 19-(O-carboxymethyl)oxime, a new hapten for 7 alpha-hydroxydehydroepiandrosterone (3 beta,7 alpha-dihydroxyandrost-5-en-17-one).
abstract: The title compound was prepared in 11 steps from 17,17-ethylenedioxy-19-hydroxyandrost-5-en-3 beta-yl acetate. After tert-butyldimethylsilyl protection of the 19-hydroxyl group, a 7-oxo group was introduced by oxidation with 3,5-dimethylpyrazole-chromium trioxide complex, and then selectively reduced with L-Selectride to give a 7 alpha-hydroxy derivative. This partially protected triol was acetylated and desilylated to 3,7-diacetate. Subsequent oxidation with pyridine-chromium trioxide complex gave 19-aldehyde, which was transformed into the corresponding protected 19-(O-carboxymethyl)oxime. Successive ketal cleavage, deacetylation, and methyl ester splitting gave the final (19E)-3 beta,7 alpha-dihydroxy-17-oxoandrost-5-en-19-al 19-(O-carboxymethyl)oxime, designed as a hapten for 7 alpha-hydroxydehydroepiandrosterone immunoassays.
authors.affiliation: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
authors.forename: V
authors.initials: V
authors.lastname: Pouzar
authors.forename: T
authors.initials: T
authors.lastname: Slavíková
authors.forename: I
authors.initials: I
authors.lastname: Cerńy
mesh_terms: D000737:Androstenols / Q000138:chemical synthesis* / Q000737:chemistry; D003687:Dehydroepiandrosterone / Q000031:analogs & derivatives* / Q000737:chemistry; D006241:Haptens / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010091:Oximes / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: C115606:3,7-dihydroxy-17-oxoandrost-5-en-19-al 19-(0-carboxymethyl)oxime; D000737:Androstenols; D006241:Haptens; D010091:Oximes; D003687:Dehydroepiandrosterone; C003587:7-hydroxydehydroepiandrosterone