• Title/Summary/Keyword: Alkoxyl radical cyclization

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Mild Isomerative Opening of Tetrahydrofuranyl Subunits in Steroids Using TFAT (trifluoroacetyl trifluoromethanesulfonate): Application to Synthesis of C17-OH Rockogenin Acetate

  • Lee, Jong-Seok;Kim, Byung-Sook;Shin, Jun-Ho;Lee, Yeon-Ju;Shin, Hee-Jae;Lee, Hyi-Seung
    • Bulletin of the Korean Chemical Society
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    • v.33 no.1
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    • pp.76-82
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    • 2012
  • A novel and efficient tetrahydrofuranyl ring opening method was developed using the highly reactive TFAT reagent in the presence of an acid scavenger, 2,6-di-tert-butyl-4-methylpyridine. Various acid sensitive groups are compatible with the reaction condition, making it generally applicable to many tetrahydrofuranyl steroids. Moreover, it is a synthetic equivalent of 'Marker degradation' affording an efficient synthesis of C17-OH rockogenin acetate.