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For some examples concerning stereoselective intramolecular conjugate additions leading to pyrrolidine or piperidine ring formation, see: a) Barco, A.; Benetti, S.; Casolari, A.; Pollini, G.P.; Spalluto, G. Tetrahedron Lett., 1990, 31, 4917-4920.
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note
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9 By using NaH in THF in the absence of a proton source, the conjugate addition leads to an equilibrium mixture and product 3, more stable, is mainly formed under thermodynamic control. On the contrary, when sodium ethoxide in ethanol is employed, the anion arising from conjugate addition immediately undergoes protonation by the solvent, so that product 4 is mainly formed under kinetic control. Studies are in progress in order to attain a deeper insight about this behaviour and for possible extension of the method to the synthesis of bioactive compounds, and will be reported in due course.
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84986437005
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The search for the low energy conformations was run using BATCHMIN program implemented in MacroModel, software package Version 5.5. All the calculations were carried out on a Silicon Graphics Indigo 2 R10000 workstation. For a reference, see: Mohamadi, F.; Richards, N.G.J.; Guida, W.C.; Liskamp, R.; Lipton, M.; Canfield, C.; Chang, G.; Hendrickson, T.; Still, W.C. J. Comput. Chem, 1990, 11, 440-448.
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52
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0013551822
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note
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The cyclisation was also performed starting from mesylate 8, but in this case bicyclic compound 9 was isolated in only 53% yield.
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53
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0013551348
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note
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Following this procedure the previouly observed partial hydrolysis (see ref. 5) of the ester group was suppressed.
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