title: Synthesis of (19E)-3 beta,17-dihydroxy-20-oxopregn-5-en-19-al 19-(O-carboxymethyl)oxime, new steroidal hapten for 17-hydroxypregnenolone.
abstract: A synthesis of (19E)-3 beta,17-dihydroxy-20-oxopregn-5-en-19-al 19-(O-carboxymethyl)oxime (15), is reported. Hydride reduction of ketone 1 gave the (20R)-hydroxy derivative 2 as the main product. Formylation of 2 followed by cleavage of the epoxide ring and mild Jones oxidation afforded aldehyde 6. Oximation with (O-carboxymethyl)hydroxylamine and subsequent methylation yielded methyl ester 8 which was selectively hydrolyzed to alcohol 9 and oxidized to ketone 10. Enolacetylation, epoxidation, and hydrolysis led to the desired 19-(O-carboxymethyl)oxime derivative of 17-hydroxypregnenolone 15.
authors.affiliation: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague.
authors.forename: V
authors.initials: V
authors.lastname: Pouzar
authors.forename: J
authors.initials: J
authors.lastname: Fajkos
mesh_terms: D006907:17-alpha-Hydroxypregnenolone / Q000031:analogs & derivatives* / Q000032:analysis / Q000138:chemical synthesis; D015415:Biomarkers / Q000032:analysis; D006241:Haptens; D011283:Pregnenes / Q000138:chemical synthesis*
chemical_list: C092666:3beta,17-dihydroxy-20-oxopregn-5-en-19-al-19-(O-carboxymethyl)oxime; D015415:Biomarkers; D006241:Haptens; D011283:Pregnenes; D006907:17-alpha-Hydroxypregnenolone