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note
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For the synthesis and structural determination of compound 7e see ref. 5.
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23
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0042489360
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note
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It was anticipated that in view of the previous results, cyanation of 6e should take place at the unsubstituted C-6 position.
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24
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0036135888
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note
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It seems likely that deprotonation of 2e yielded an intermediate lithiated species which was attacked from the equatorial direction by the electrophile to produce 3e with the stereochemistry indicated in the Fig. 1. For leading references concerning the reactivity of nitrile-stabilized carbanions see: F. F. Fleming and B. C. Shook, Tetrahedron, 2002, 58, 1 and references cited therein.
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CCDC reference number 195340. See http://www.rsc.org/suppdata/ob/b2/b209387a/ for crystallographic files in .cif or other electronic format.
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