Journal
ORGANIC LETTERS
Volume 6, Issue 6, Pages 957-960Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol036456d
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Samarium diiodide promotes smooth reductive cyclizations of gamma-naphthyl-substituted ketones to afford tri- and tetracyclic compounds in high yields and with excellent stereoselectivities. Cyclic ketones furnish steroid-like compounds with unnatural cis/cis annulation of rings B/C/D. The remaining styrene-type double bond of ring B allows further stereoselective reactions. Cases with matched and mismatched relative configuration could be identified leading to dramatic differences in the ring closure ability.
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