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pubmed-article:14572249pubmed:abstractText[reaction: see text]. Polyphosphoric acid trimethylsilyl ester (PPSE)-promoted intramolecular Friedel-Crafts reactions on a nonaromatic carboxylic acid system have been investigated. Studies led to the synthesis of C-18 functionalized steroidal compounds 5 and 9a-d with strict retention of the spiroketals. Isomerization of spiroketal 9e was studied.lld:pubmed
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pubmed-article:14572249pubmed:articleTitlePolyphosphoric acid trimethylsilyl ester promoted intramolecular acylation of an olefin by a carboxylic acid: convenient construction of C-18-functionalized delta14-hecogenin acetate.lld:pubmed
pubmed-article:14572249pubmed:affiliationDepartment of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.lld:pubmed
pubmed-article:14572249pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:14572249pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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