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After this manuscript was submitted, we became aware of prior work of Stryker. Specifically, he has reported three examples with three substrates in which the use of t-BuOH as an additive (10-15 equiv) allowed for the catalytic conjugate reduction to be carried out at 1 atm of hydrogen using 10-17 mol % Cu in 24-48 h. In the best case, the reduction of carvone is reduced to a 87:13 ratio of the conjugate reduction product and the overreduced saturated alcohol. The authors attribute the effect of the added t-BuOH to "a protolytic transfer process to quench the unstable intermediates with concomitant transfer of the copper to a more stable alkoxide moiety where hydrogen activation can proceed under lower pressure." Stryker has also demonstrated that the addition of t-BuOH often favors 1,2-reduction. (a) Lipshutz, B. H. In Modern Organocopper Chemistry; Krause, N., Ed.; Wiley-VCH: Weinheim, 2002; p 167. (b) Stryker, J. M.; Mahoney, W. S.; Daeuble, J. F.; Brestensky, D. M. In Catalysis in Organic Synthesis; Pascoe, W. E., Ed.; Marcel Dekker: New York, 1992; p 29. (c) Daeuble, J. F.; Stryker, J. M. In Catalysis of Organic Reactions; Scaros, M., Prunier, M. L., Eds.; Marcel Dekker: New York. 1995; p 235. (d) Chen, J. X. ; Daeuble, J. F.; Brestensky, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2153. (e) Chen, J. X.; Daeuble, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2789.
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25
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0342826467
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Pascoe, W. E., Ed.; Marcel Dekker: New York
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After this manuscript was submitted, we became aware of prior work of Stryker. Specifically, he has reported three examples with three substrates in which the use of t-BuOH as an additive (10-15 equiv) allowed for the catalytic conjugate reduction to be carried out at 1 atm of hydrogen using 10-17 mol % Cu in 24-48 h. In the best case, the reduction of carvone is reduced to a 87:13 ratio of the conjugate reduction product and the overreduced saturated alcohol. The authors attribute the effect of the added t-BuOH to "a protolytic transfer process to quench the unstable intermediates with concomitant transfer of the copper to a more stable alkoxide moiety where hydrogen activation can proceed under lower pressure." Stryker has also demonstrated that the addition of t-BuOH often favors 1,2-reduction. (a) Lipshutz, B. H. In Modern Organocopper Chemistry; Krause, N., Ed.; Wiley-VCH: Weinheim, 2002; p 167. (b) Stryker, J. M.; Mahoney, W. S.; Daeuble, J. F.; Brestensky, D. M. In Catalysis in Organic Synthesis; Pascoe, W. E., Ed.; Marcel Dekker: New York, 1992; p 29. (c) Daeuble, J. F.; Stryker, J. M. In Catalysis of Organic Reactions; Scaros, M., Prunier, M. L., Eds.; Marcel Dekker: New York. 1995; p 235. (d) Chen, J. X. ; Daeuble, J. F.; Brestensky, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2153. (e) Chen, J. X.; Daeuble, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2789.
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26
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0039004514
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Scaros, M., Prunier, M. L., Eds.; Marcel Dekker: New York
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After this manuscript was submitted, we became aware of prior work of Stryker. Specifically, he has reported three examples with three substrates in which the use of t-BuOH as an additive (10-15 equiv) allowed for the catalytic conjugate reduction to be carried out at 1 atm of hydrogen using 10-17 mol % Cu in 24-48 h. In the best case, the reduction of carvone is reduced to a 87:13 ratio of the conjugate reduction product and the overreduced saturated alcohol. The authors attribute the effect of the added t-BuOH to "a protolytic transfer process to quench the unstable intermediates with concomitant transfer of the copper to a more stable alkoxide moiety where hydrogen activation can proceed under lower pressure." Stryker has also demonstrated that the addition of t-BuOH often favors 1,2-reduction. (a) Lipshutz, B. H. In Modern Organocopper Chemistry; Krause, N., Ed.; Wiley-VCH: Weinheim, 2002; p 167. (b) Stryker, J. M.; Mahoney, W. S.; Daeuble, J. F.; Brestensky, D. M. In Catalysis in Organic Synthesis; Pascoe, W. E., Ed.; Marcel Dekker: New York, 1992; p 29. (c) Daeuble, J. F.; Stryker, J. M. In Catalysis of Organic Reactions; Scaros, M., Prunier, M. L., Eds.; Marcel Dekker: New York. 1995; p 235. (d) Chen, J. X. ; Daeuble, J. F.; Brestensky, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2153. (e) Chen, J. X.; Daeuble, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2789.
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0034616210
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After this manuscript was submitted, we became aware of prior work of Stryker. Specifically, he has reported three examples with three substrates in which the use of t-BuOH as an additive (10-15 equiv) allowed for the catalytic conjugate reduction to be carried out at 1 atm of hydrogen using 10-17 mol % Cu in 24-48 h. In the best case, the reduction of carvone is reduced to a 87:13 ratio of the conjugate reduction product and the overreduced saturated alcohol. The authors attribute the effect of the added t-BuOH to "a protolytic transfer process to quench the unstable intermediates with concomitant transfer of the copper to a more stable alkoxide moiety where hydrogen activation can proceed under lower pressure." Stryker has also demonstrated that the addition of t-BuOH often favors 1,2-reduction. (a) Lipshutz, B. H. In Modern Organocopper Chemistry; Krause, N., Ed.; Wiley-VCH: Weinheim, 2002; p 167. (b) Stryker, J. M.; Mahoney, W. S.; Daeuble, J. F.; Brestensky, D. M. In Catalysis in Organic Synthesis; Pascoe, W. E., Ed.; Marcel Dekker: New York, 1992; p 29. (c) Daeuble, J. F.; Stryker, J. M. In Catalysis of Organic Reactions; Scaros, M., Prunier, M. L., Eds.; Marcel Dekker: New York. 1995; p 235. (d) Chen, J. X. ; Daeuble, J. F.; Brestensky, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2153. (e) Chen, J. X.; Daeuble, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2789.
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0034724764
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After this manuscript was submitted, we became aware of prior work of Stryker. Specifically, he has reported three examples with three substrates in which the use of t-BuOH as an additive (10-15 equiv) allowed for the catalytic conjugate reduction to be carried out at 1 atm of hydrogen using 10-17 mol % Cu in 24-48 h. In the best case, the reduction of carvone is reduced to a 87:13 ratio of the conjugate reduction product and the overreduced saturated alcohol. The authors attribute the effect of the added t-BuOH to "a protolytic transfer process to quench the unstable intermediates with concomitant transfer of the copper to a more stable alkoxide moiety where hydrogen activation can proceed under lower pressure." Stryker has also demonstrated that the addition of t-BuOH often favors 1,2-reduction. (a) Lipshutz, B. H. In Modern Organocopper Chemistry; Krause, N., Ed.; Wiley-VCH: Weinheim, 2002; p 167. (b) Stryker, J. M.; Mahoney, W. S.; Daeuble, J. F.; Brestensky, D. M. In Catalysis in Organic Synthesis; Pascoe, W. E., Ed.; Marcel Dekker: New York, 1992; p 29. (c) Daeuble, J. F.; Stryker, J. M. In Catalysis of Organic Reactions; Scaros, M., Prunier, M. L., Eds.; Marcel Dekker: New York. 1995; p 235. (d) Chen, J. X. ; Daeuble, J. F.; Brestensky, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2153. (e) Chen, J. X.; Daeuble, D. M.; Stryker, J. M. Tetrahedron 2000, 56, 2789.
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For other examples of alcohols and amines accelerating metal-catalyzed silane reductions, see: (a) Verdaguer, X.; Lange, U. E. W.; Buchwald, S. L. Angew. Chem., Int. Ed. 1998, 37, 1103. (b) Yun, J.; Buchwald, S. L. J. Am. Chem. Soc. 1999, 121, 5640. (c) Hays, D. S.; Fu, G. C. Tetrahedron 1999, 55, 8815.
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For other examples of alcohols and amines accelerating metal-catalyzed silane reductions, see: (a) Verdaguer, X.; Lange, U. E. W.; Buchwald, S. L. Angew. Chem., Int. Ed. 1998, 37, 1103. (b) Yun, J.; Buchwald, S. L. J. Am. Chem. Soc. 1999, 121, 5640. (c) Hays, D. S.; Fu, G. C. Tetrahedron 1999, 55, 8815.
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2, was observed upon addition of EtOH.
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Fukushima, C.2
Ukita, T.3
Miyagishima, T.4
Ohmizu, H.5
Iwasaki, T.6
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45
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0042375537
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note
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It should be noted that the reduction of β-methyl substituted butenolide continues to suffer from poor mass balance, even under optimized conditions.
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46
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0000187570
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Hughes, G.; Buchwald, S. L., unpublished results. For related effects in catalytic enantioselective copper-hydride reductions of ketones, see: Sirol, S. ; Courarcel, J.; Mostefai, N.; Riant, O. Org. Lett. 2001, 3, 4111.
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(2001)
Org. Lett.
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, pp. 4111
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Sirol, S.1
Courarcel, J.2
Mostefai, N.3
Riant, O.4
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47
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0041874429
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note
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2 and 10 equiv of t-BuONa per ligand, whereas an excess of Cu and base per ligand under anaerobic conditions was found to give poor conversions.
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49
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0032490973
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We presume that tosyl transfer occurs between 26 and 27 to produce a primary tosylate and a phenol, In the presence of base, the phenol displaces the primary tosylate to afford the desired coupling product. For similar examples of transfer of activation, see: (a) Sobolov, S, B.; Sun, J.; Cooper, B. A. Tetrahedron Lett. 1998, 39, 5685. (b) Kim, T. H.; Lee, G.-J. J. Org. Chem. 1999, 65, 2941.
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(1998)
Tetrahedron Lett.
, vol.39
, pp. 5685
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Sobolov, S.B.1
Sun, J.2
Cooper, B.A.3
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50
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0000100042
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We presume that tosyl transfer occurs between 26 and 27 to produce a primary tosylate and a phenol, In the presence of base, the phenol displaces the primary tosylate to afford the desired coupling product. For similar examples of transfer of activation, see: (a) Sobolov, S, B.; Sun, J.; Cooper, B. A. Tetrahedron Lett. 1998, 39, 5685. (b) Kim, T. H.; Lee, G.-J. J. Org. Chem. 1999, 65, 2941.
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(1999)
J. Org. Chem.
, vol.65
, pp. 2941
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Kim, T.H.1
Lee, G.-J.2
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51
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0012932027
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13C NMR: Roeder, E.; Krauss, H. Liebigs Ann. Chem. 1992, 177. Optical rotation: Kosugi, H.; Tagami, K.; Takahashi, A.; Kanna, H.; Uda, H. J. Chem. Soc., Perkin Trans. 1 1989, 935.
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(1992)
Liebigs Ann. Chem.
, pp. 177
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Roeder, E.1
Krauss, H.2
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52
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37049076814
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13C NMR: Roeder, E.; Krauss, H. Liebigs Ann. Chem. 1992, 177. Optical rotation: Kosugi, H.; Tagami, K.; Takahashi, A.; Kanna, H.; Uda, H. J. Chem. Soc., Perkin Trans. 1 1989, 935.
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(1989)
J. Chem. Soc., Perkin Trans. 1
, pp. 935
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Kosugi, H.1
Tagami, K.2
Takahashi, A.3
Kanna, H.4
Uda, H.5
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53
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0001644454
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13C NMR: Kayser, M. M.; Chen, G.; Stewart, J. D. J. Org. Chem. 1998, 63, 7103. Optical rotation: Jones, J. B.; Lok, K. P. Can. J. Chem. 1979, 57, 1025.
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(1998)
J. Org. Chem.
, vol.63
, pp. 7103
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Kayser, M.M.1
Chen, G.2
Stewart, J.D.3
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54
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0001766261
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13C NMR: Kayser, M. M.; Chen, G.; Stewart, J. D. J. Org. Chem. 1998, 63, 7103. Optical rotation: Jones, J. B.; Lok, K. P. Can. J. Chem. 1979, 57, 1025.
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(1979)
Can. J. Chem.
, vol.57
, pp. 1025
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Jones, J.B.1
Lok, K.P.2
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