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selenonium groups can also be easily displaced by nucleophiles. This property has been employed to develop a one-pot cyclopropanation reaction starting from vinylselenonium salts:
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n) selenonium groups can also be easily displaced by nucleophiles. This property has been employed to develop a one-pot cyclopropanation reaction starting from vinylselenonium salts:
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43
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68949123985
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Vinyl selenones are prepared by oxidation of the corresponding selenides (see Supporting Information). For an update review on the synthesis of vinyl selenides see: G. Perin, E. J. Lenardao, R. G. Jacob, R. B. Panatieri, Chem. Rev. 2009, 109, 1277.
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Vinyl selenones are prepared by oxidation of the corresponding selenides (see Supporting Information). For an update review on the synthesis of vinyl selenides see: G. Perin, E. J. Lenardao, R. G. Jacob, R. B. Panatieri, Chem. Rev. 2009, 109, 1277.
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2 and that the phenyl (E)-2-phenylethenyl sulfone is not reactive. See: H. Li, J. Song, L. Deng Tetrahedron 2009, 65, 3139. We tested one of the Deng's C6′-OH Cinchona alkaloid catalysts on 3A obtaining the adducts 4a/5a in low yield and poor diastereo- and enantioselectivity.
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2 and that the phenyl (E)-2-phenylethenyl sulfone is not reactive. See: H. Li, J. Song, L. Deng Tetrahedron 2009, 65, 3139. We tested one of the Deng's C6′-OH Cinchona alkaloid catalysts on 3A obtaining the adducts 4a/5a in low yield and poor diastereo- and enantioselectivity.
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For Cinchona alkaloids-catalyzed asymmetric conjugate addition of carbon nucleophiles to β-unsubstituted vinyl sulfones see: a T.-Y. Liu, J. Long, B.-J. Li, L. Jiang, R. Li, Y. Wu, L.-S. Ding, Y.-C. Chen, Org. Biomol. Chem. 2006, 4, 2097;
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[15a]). The absolute configuration was assigned as 1S,2S by its (-) optical rotation typical for the (25)-isomers of 2-phenyl substituted cyclopropanecarboxylic derivatives. See: a) W. von E. Doering, L. R. Robertson, E. E. Ewing, J. Org. Chem. 1983, 48, 4280;
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[15a]). The absolute configuration was assigned as 1S,2S by its (-) optical rotation typical for the (25)-isomers of 2-phenyl substituted cyclopropanecarboxylic derivatives. See: a) W. von E. Doering, L. R. Robertson, E. E. Ewing, J. Org. Chem. 1983, 48, 4280;
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1H NMR spectrum and specific optical rotation, respectively, with those reported in the literature. See: T. Kusumoto, A. Nakayama, K. Sato, T. Hiyama, S. Takehara, T. Shoji, M. Osawa, T. Kuriyama, K. Nakamura, T. Fujisawa, Tetrahedron Lett. 1991, 32, 939.
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1H NMR spectrum and specific optical rotation, respectively, with those reported in the literature. See: T. Kusumoto, A. Nakayama, K. Sato, T. Hiyama, S. Takehara, T. Shoji, M. Osawa, T. Kuriyama, K. Nakamura, T. Fujisawa, Tetrahedron Lett. 1991, 32, 939.
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Simple cyanoacetates or other unsubstituted activated methylenic compounds add to β-substituted vinyl selenones generating directly 2-substituted cyclopropanecarboxylic esters through an alternative cascade process which involves a Michael addition, a proton exchange and a cyclization by displacement of the PhSeO2 group.[6j,l,m] The organocatalytic version of this process merits investigations. These are currently under way in our laboratory
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[6j,l,m] The organocatalytic version of this process merits investigations. These are currently under way in our laboratory.
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[6j]), the (E)-vinyl selenones 3A-F were prepared from the corresponding commercial or easily available vinyl bromides. See: a) H.-W You,. K.-J. Lee Synlett 2001 105;
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[6j]), the (E)-vinyl selenones 3A-F were prepared from the corresponding commercial or easily available vinyl bromides. See: a) H.-W You,. K.-J. Lee Synlett 2001 105;
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The vinyl selenide precursor of the (E)-vinyl selenone 3G was prepared from commercial 1-octene and PhSeBr following a literature procedure: S. Raucher, M. R. Hansen, M. A. Colter, J. Org. Chem. 1978, 43, 4885.
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The vinyl selenide precursor of the (E)-vinyl selenone 3G was prepared from commercial 1-octene and PhSeBr following a literature procedure: S. Raucher, M. R. Hansen, M. A. Colter, J. Org. Chem. 1978, 43, 4885.
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