Synthesis of pentacyclic lα,11-(2-oxethano) steroids |
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| Authors: | B-R Tolf DF Crowe JG Johansson RR Peters M Tanabe |
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| Institution: | Bio-Organic Chemistry Laboratory, SRI International, Menlo Park, California 94025, U.S.A. |
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| Abstract: | Treatment of a 1α,2α-methyleneandrostan analog (4) with hydrobromic acid/acetic acid gives an apparent intramolecular homoconjugate ring-opening, which serves as the key step in the synthesis of a new type of pentacyclic steroid analogs (2). |
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