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Chen, F.; Mudryk, B.; Cohen, T. Tetrahedron 1999, 55, 3291-3304.
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36
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33645027099
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note
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7 in which phenyl thioethers are substrates (two examples),
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37
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0003320995
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in which a nitrile was the substrate (one example)
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by (b) Rychnovsky, S. D.; Hata, T.; Kim, A. I.; Buckmelter, A. J. Org. Lett. 2001. 3, 807-810 in which a nitrile was the substrate (one example),
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Rychnovsky, S.D.1
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Buckmelter, A.J.4
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38
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0037090329
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preliminary communication
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and by (c) Yus, M.; Ortiz, R.; Huerta, F. F. Tetrahedron Lett. 2002, 43, 2957-2960 (preliminary communication);
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Yus, M.1
Ortiz, R.2
Huerta, F.F.3
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40
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12944312239
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two other examples appeared in which a nitrile was the substrate: (d) Takaoka, L. R.; Buckmelter, A. J.; LaCruz, T. E.; Rychnovsky, S. D. J. Am. Chem. Soc. 2005, 127, 528-529.
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Takaoka, L.R.1
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Rychnovsky, S.D.4
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43
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33645029923
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note
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After our study of this cyclization was completed, ref 17b,c appeared in which tertiary organolithiums, prepared by reductive lithiation of a nitrile and an alkyl chloride, respectively, were added intramolecularly to alkenes.
-
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44
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33645017260
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note
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It is somewhat surprising that the analogue of 4 bearing ethyl groups in place of the methyl groups of 4 was reported in ref 17c (in the preliminary communication in Tetrahedron Lett., the organolithium 4 itself was erroneously drawn and the error was corrected in the Tetrahedron full paper) to be unstable at -78 °C, removing a proton from the solvent THF. In our experiment, 4 survived except for some cyclization to 7. While the diethyl analogue would be expected to be more basic than 4, it is possible that the proton that replaced the lithium was contributed by the added electrophile, 3-pentanone.
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-
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45
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33645025392
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note
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Yields slightly higher and slightly lower than this range were observed when the reductive lithiation was performed in the presence of the carbonyl-trapping reagent.
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-
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46
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33645033213
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note
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For the reader's guidance, it should be noted that (1) the secondary organolithium used was depicted as 10 in the preliminary communication in ref 17c, but that was acknowledged to be in error in the full paper and to be 6-lithio-1-nonene instead, and (2) the product of cyclization of the secondary organolithium in the full paper is drawn as 2-ethylcyclopentylmethyllithium whereas it must actually be 2-n-propylcyclopentylmethyllithium.
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47
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0027931236
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Cohen, T., Zhang, B., Cherkauskas, J. P. Tetrahedron 1994, 50, 11569-11584.
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49649150095
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The corresponding carbomagnesiation, occurring at a higher temperature, also produces mainly trans product: Kossa, J. W. C.; Rees, T. C.; Richey, J. H. G. Tetrahedron Lett. 1971, 12, 3455-3458.
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56
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33645028025
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note
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Metallo-ene cyclizations are also intramolecular carbometalations resulting most usually in five-membered rings, but they differ from the cyclizations described in the present paper in that the organometallic is an ailylmetal rather than an unconjugated alkylmetal.
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57
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13C NMR) were identical to the literature values. Molander, G. A.; Mckie, J. J. Org. Chem. 1992, 57, 3132-3139.
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67
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33645033443
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note
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2b quite reasonably invoked coordination of the Li attached to carbon to both the axial O atom and the π bond in a conformation analogous to 24b in a study of the cyclization of the analogue of 24 lacking the C-methyl group and with a MeO group in place of the OLi group of 24 in order to account for the modest cis selectivity under certain conditions. Such interaction appears to be weak according to the data provided, and it is not unexpected in view of the fact that the supposedly more powerful electrophilic participation that we suggest is not available in the case of the ether.
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68
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Sticker, H.; Ohloff, G.; Kovats, E. Helv. Chim. Acta 1967, 78, 759-797.
-
(1967)
Helv. Chim. Acta
, vol.78
, pp. 759-797
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-
Sticker, H.1
Ohloff, G.2
Kovats, E.3
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84
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0032560141
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-
Aurell, M. J.; Gil, S.; Mestres, R.; Parra, M.; Parra, L. Tetrahedron 1998, 54, 4357-4366.
-
(1998)
Tetrahedron
, vol.54
, pp. 4357-4366
-
-
Aurell, M.J.1
Gil, S.2
Mestres, R.3
Parra, M.4
Parra, L.5
-
85
-
-
33645033103
-
-
note
-
Experimental details for the preparation of LDMAN can be found in the Supporting Information.
-
-
-
-
86
-
-
33645017949
-
-
note
-
Experimental details for the preparation of LDBB can be found in the Supporting Information.
-
-
-
-
87
-
-
33645034294
-
-
note
-
"*" Means that the compound is racemic and thus that these are relative configurations.
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-
-
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