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For the kinetic resolution of allylic epoxides with dialkylzinc reagents and copper-phosphoramidite catalyst, see: (a) Badalassi, F.; Crotti, P.; Macchia, F.; Pineschi, M.; Arnold, A.; Feringa, B. L. Tetrahedron Lett. 1998, 39, 7795.
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0037414323
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(S,R,R)-Diastereoisomeric phosphoramidite, derived from (S)-BINOL and (R)-bisphenylethylamine developed by Feringa et al., is to date one of the most effective chiral ligands for the enantioselective addition of dialkylzinc to cyclic enones and for other metal-catalyzed asymmetric processes. For some recent examples, see: (a) Duursma, A.; Minnaard, A. J.; Feringa, B. L. J. Am. Chem. Soc. 2003, 125, 3700 and references therein.
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1642394569
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However, this is not always true for all the examined substrates. For example, the use of THF with 1,3-cyclohexadiene monoepoxide 3 afforded a more complex reaction mixture containing also variable amounts of syn adducts.
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31
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0011409480
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For a recent example concerning the syn addition of organozinc species to cyclic 1,3-diene monoepoxides, see: Xue, S.; Li, Y.; Ha, K.; Yin, W.; Wang, M.; Guo, Q. Org. Lett. 2002, 4, 905.
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36
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1642400978
-
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note
-
Attempts to perform the reaction entirely at rt gave 3-cycloheptenone as the major product and only trace amounts of addition compounds.
-
-
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37
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0032473509
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For reviews on the enantioselective formation of quaternary carbon stereocenters, see: (a) Corey, E. J.; Guzmán-Pérez, A. Angew. Chem., Int. Ed. 1998, 37, 388.
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1642418746
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note
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N2′ adducts 37a,b (95% of the crude mixture) was observed. This is a clear, even if indirect, indication that a chiral recognition is present to some extent for isoprene monoepoxide.
-
-
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40
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0000179583
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Tseng, C. C.; Paisley, S. D.; Goering, H. L. J. Org. Chem. 1986, 51, 2884.
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0001526137
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For a study on the relationship of the double bond configuration between reactants and products in the cross-coupling reactions of allylic substrates with organocopper reagents, see: Underiner, T. L.; Paisley, S. E.; Schmitter, J.; Leshesky, L.; Goering, H. L. J. Org. Chem. 1989, 54, 2369.
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45
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1642357193
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note
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The E configuration of the double bonds in compounds 51a-c has been established by 1D ROESY spectra (see the Supporting Information).
-
-
-
-
46
-
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0035805286
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For very recent experimental evidence supporting the incursion of Cu(III) intermediates, see: Karlström, A. S. E.; Bäckwall, J.-E. Chem.-Eur. J. 2001, 7, 1981 and references therein.
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For the importance of the reductive elimination step in a copper-catalyzed conjugate addition, see: Nakamura, E.; Yamanaka, M.; Mori, S. J. Am. Chem. Soc. 2000, 122, 1826.
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48
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33845183760
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Marshall, J.A.1
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1642315046
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Due to the scarcity of direct methods to investigate the reaction pathway, the obtainment of σ-allyl-copper(III) species B, in equilibrium with regioisomeric σ-allyl-copper(III) species C, through a π-allyl complex or a suprafacial 1,3-sigmatropic shift cannot be ruled out. However, the substantial preservation of the stereochemical integrity of the original double bonds present in the SN2 adducts seems to indicate that the reductive elimination step is faster than the eventual incursion of syn/anti isomerization processes.
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