title: Synthesis of the aglycone of the shark repellent pavoninin-4 using remote functionalization.
abstract: [reaction: see text] The aglycone of shark repellent pavoninin-4, (25R)-5alpha-cholestan-3alpha,15alpha,26-triol 26-acetate 1a, was synthesized from (25R)-cholest-5-en-3beta,26-diol 4 (26-hydroxycholesterol) in eight steps in 18% overall yield. Breslow's remote functionalization strategy was used as a key step to introduce the C-15alpha alcohol on a steroid D ring. An efficient synthesis of the 26-hydroxycholesterol from the 16beta hydroxyl steroid, (25R)-cholest-5-ene-3beta,16beta,26-triol (3a), is also reported.
authors.affiliation: Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122-2585, USA.
authors.forename: Hua
authors.initials: H
authors.lastname: Gong
authors.forename: John R
authors.initials: JR
authors.lastname: Williams
mesh_terms: D000617:Aminoglycosides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D002784:Cholesterol / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D015394:Molecular Structure; D012754:Sharks; D013237:Stereoisomerism
chemical_list: D000617:Aminoglycosides; D002784:Cholesterol; C507447:pavoninin-4