-
1
-
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34547746450
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For recent, representative examples, see: a
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For recent, representative examples, see: (a) Chaulagain, M. R.; Sormunen, G. J.; Montgomery, J. J. Am. Chem. Soc. 2007, 129, 9568-9569.
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(b) Herath, A.; Thompson, B. B.; Montgomery, J. J. Am. Chem. Soc. 2007, 129, 8712-8713.
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(c) Yang, Y.; Zhu, S.-F.; Duan, H.-F.; Zhou, C.-Y.; Wang, L.-X.; Zhou, Q.-L. J. Am. Chem. Soc. 2007, 129, 2248-2249.
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33750430849
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(e) Samih ElDouhaibi, A.; Lozanov, M.; Montgomery, J. Tetrahedron 2006, 62, 11460-11469.
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Samih ElDouhaibi, A.1
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33745728204
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(f) Kimura, M.; Ezoe, A.; Mori, M.; Iwata, K.; Tamaru, Y. J. Am. Chem. Soc. 2006, 128, 8559-8568.
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33745420514
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(g) Moslin, R. M.; Miller, K. M.; Jamison, T. F. Tetrahedron 2006, 62, 7598-7610.
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8
-
-
25444480800
-
-
(h) Knapp-Reed, B.; Mahandru, G. M.; Montgomery, J. J. Am. Chem. Soc. 2005, 127, 13156-13157.
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Knapp-Reed, B.1
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(i) Maezaki, N.; Sawamoto, H.; Ishihara, H.; Tanaka, T. Chem. Commun. 2005, 3992-3994.
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7744226165
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4544296892
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(m) Patel, S. J.; Jamison, T. F. Angew. Chem., Int. Ed. 2004, 43, 3941-3944.
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1642354777
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0035476966
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(q) Kimura, M.; Ezoe, A.; Tanaka, S.; Tamaru, Y. Angew. Chem., Int. Ed. 2001, 40, 3600-3602.
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0001008119
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(r) Shibata, K.; Kimura, M.; Shimizu, M.; Tamaru, Y. Org. Lett. 2001, 3, 2181-2183.
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0033082780
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(t) Montgomery, J.; Oblinger, E.; Savchenko, A. V. J. Am. Chem. Soc. 1997, 119, 4911-4920.
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4544323639
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Montgomery, J.1
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22
-
-
44949247865
-
-
The Zhou and Tamaru groups have reported isolated examples of both inter- and intramolecular reductive couplings of dienyl esters with aldehydes, where coupling occurred α to the ester carbonyl. However, it is the diene functionalities of these substrates that are essential for reaction to proceed, rather than the α,β-unsaturated ester. See refs 1c, 1f, and 1q
-
The Zhou and Tamaru groups have reported isolated examples of both inter- and intramolecular reductive couplings of dienyl esters with aldehydes, where coupling occurred α to the ester carbonyl. However, it is the diene functionalities of these substrates that are essential for reaction to proceed, rather than the α,β-unsaturated ester. See refs 1c, 1f, and 1q.
-
-
-
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24
-
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0000191874
-
-
For a seminal reference, see: a
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33846995439
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For an extensive collection of reports of catalytic reductive aldol reactions, see references cited within: b
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For an extensive collection of reports of catalytic reductive aldol reactions, see references cited within: (b) Ngai, M.-Y.; Kong, J.-R.; Krische, M. J. J. Org. Chem. 2006, 72, 1063-1072.
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34347225080
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4544221000
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Chiu, P.1
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33
-
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35549009016
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-
For infermolecular variants of these reactions, see
-
For infermolecular variants of these reactions, see: Lumby, R. J. R.; Joensuu, P. M.; Lam, H. W. Org. Lett. 2007, 9, 4367-4370.
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Lumby, R.J.R.1
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34
-
-
29444433067
-
-
The products 4a, 4b, 4d, 4e, 4g, 4i, 4j, 41, and 4m have been described previously see ref 6, Product 4h has been described previously: Lam, H. W, Murray, G. J, Firth, J. D. Org. Lett. 2005, 7, 5743-5746. The relative stereochemistries of the remaining products in Table 1 were assigned by analogy
-
The products 4a, 4b, 4d, 4e, 4g, 4i, 4j, 41, and 4m have been described previously (see ref 6). Product 4h has been described previously: Lam, H. W.; Murray, G. J.; Firth, J. D. Org. Lett. 2005, 7, 5743-5746. The relative stereochemistries of the remaining products in Table 1 were assigned by analogy
-
-
-
-
35
-
-
0037419835
-
-
For examples of alkylative aldol cyclizations (sequential 1,4-conjugate addition-intramolecular aldol reactions, see: (a) Caube, D. F, Gipson, J. D, Krische, M. J. J. Am. Chem. Soc. 2003, 125, 1110-1111
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For examples of alkylative aldol cyclizations (sequential 1,4-conjugate addition-intramolecular aldol reactions), see: (a) Caube, D. F.; Gipson, J. D.; Krische, M. J. J. Am. Chem. Soc. 2003, 125, 1110-1111.
-
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36
-
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1842631430
-
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(b) Bocknack, B. M.; Wang, L.-C.; Krische, M. J. Proc. Natl. Acad. Sci. U.S.A. 2004, 101, 5421-5424.
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1842637789
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(c) Agapiou, K.; Cauble, D. F.; Krische, M. J. J. Am. Chem. Soc. 2004, 126, 4528-4529.
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Agapiou, K.1
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38
-
-
25444446131
-
-
Compare with results obtained using copper bisphosphine catalysts in conjunction with siloxane reductants: Lam, H. W, Joensuu, P. M. Org. Lett. 2005, 7, 4225-4228
-
Compare with results obtained using copper bisphosphine catalysts in conjunction with siloxane reductants: Lam, H. W.; Joensuu, P. M. Org. Lett. 2005, 7, 4225-4228.
-
-
-
-
39
-
-
44949249443
-
-
The products 21a-21d have been described previously see ref 10, and the relative stereochemistries of the remaining products in Table 2 were assigned by analogy
-
The products 21a-21d have been described previously (see ref 10), and the relative stereochemistries of the remaining products in Table 2 were assigned by analogy.
-
-
-
-
41
-
-
38549132389
-
-
Johnson, J. B.; Rovis, T. Angew. Chem., Int. Ed. 2008, 47, 840-871.
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34447314475
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(a) Ogoshi, S.; Ikeda, H.; Kurosawa, H. Angew. Chem., Int. Ed. 2007, 46, 4930-4932.
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33744795735
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(b) Ogoshi, S.; Tonomori, K.; Oka, M.; Kurosawa, H. J. Am. Chem. Soc. 2006, 128, 7077-7086.
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25144460599
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(d) Ogoshi, S.; Oka, M.; Kurosawa, H. J. Am. Chem. Soc. 2004, 126, 11802-11803.
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46
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4944241519
-
-
(a) Hratchian, H. P.; Chowdhury, S. K.; Gutiérrez-García, V. M.; Amarasinghe, K. K. D.; Heeg, M. J.; Schlegel, H. B.; Montgomery, J. Organometallics 2004, 23, 4636-4646.
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0035809288
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(b) Amarsinghe, K. K. D.; Chowdhury, S. K.; Heeg, M. J.; Montgomery, J. Organometallics 2001, 20, 370-372.
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Amarsinghe, K.K.D.1
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-
48
-
-
44949141090
-
-
A more detailed discussion of the putative conversion of intermediates of general structure 31 into zinc enolates is provided in the discussion of reaction mechanism (see Scheme 12).
-
A more detailed discussion of the putative conversion of intermediates of general structure 31 into zinc enolates is provided in the discussion of reaction mechanism (see Scheme 12).
-
-
-
-
49
-
-
33947468884
-
-
Zimmerman, H. E.; Traxler, M.; D, J. Am. Chem. Soc. 1957, 79, 1920-1923.
-
Zimmerman, H. E.; Traxler, M.; D, J. Am. Chem. Soc. 1957, 79, 1920-1923.
-
-
-
-
50
-
-
0025950422
-
-
Conjugate reductions of sterically hindered di- and trisubstituted enones in low yields have been observed previously in attempted conjugate addition reactions using Ni(acac)2/Et2Zn. See: (a) Chaloner, P. A, Hitchcock, P. B, Langadianou, E, Readney, M. J. Tetrahedron Lett. 1991, 32, 6037-6038
-
2Zn. See: (a) Chaloner, P. A.; Hitchcock, P. B.; Langadianou, E.; Readney, M. J. Tetrahedron Lett. 1991, 32, 6037-6038.
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51
-
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0000836984
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(b) Bolm, C.; Ewald, M.; Felder, M. Chem. Ber. 1992, 125, 1205-1215.
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52
-
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0030908371
-
-
2Zn-mediated conjugate reductions of α,β-unsaturated amides.
-
2Zn-mediated conjugate reductions of α,β-unsaturated amides.
-
-
-
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54
-
-
34250747538
-
-
(b) Blake, A. J.; Shannon, J.; Stephens, J. C.; Woodward, S. Chem. - Eur. J. 2007, 13, 2462-2472.
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Blake, A.J.1
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-
55
-
-
44949191952
-
-
The cyclization of 39 using Me3Al (2 equiv) in place of Et2Zn also resulted in the formation of 49 in ca. 80% conversion. Montgomery and co-workers have shown that bisenone substrates tethered through their β-carbons undergo nickel-catalyzed reductive cyclizations in the presence of organozincs lacking β-hydrogens. See ref 1t
-
2Zn also resulted in the formation of 49 in ca. 80% conversion. Montgomery and co-workers have shown that bisenone substrates tethered through their β-carbons undergo nickel-catalyzed reductive cyclizations in the presence of organozincs lacking β-hydrogens. See ref 1t.
-
-
-
-
56
-
-
44949175497
-
-
See the Supporting Information for details
-
See the Supporting Information for details.
-
-
-
-
57
-
-
44949135962
-
-
Purification of the product of the reaction depicted in eq 19 by column chromatography gave 56a/56b in a 1:1.5 ratio (relative stereochemistries of major and minor isomers not assigned).
-
Purification of the product of the reaction depicted in eq 19 by column chromatography gave 56a/56b in a 1:1.5 ratio (relative stereochemistries of major and minor isomers not assigned).
-
-
-
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59
-
-
44949255889
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-
1H NMR spectra. See: (a) Pederson, B. F.; Pederson, B. Tetrahedron Lett. 1965, 6, 2995-3001.
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1H NMR spectra. See: (a) Pederson, B. F.; Pederson, B. Tetrahedron Lett. 1965, 6, 2995-3001.
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60
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0024460631
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0037009992
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36849015870
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For relevant examples involving Ni(0)-catalyzed reactions, see: (a) Hirano, K. Yorimitsu, H. Oshima, K. Org. Lett. 2007, 9, 5031-5033.
-
For relevant examples involving Ni(0)-catalyzed reactions, see: (a) Hirano, K. Yorimitsu, H. Oshima, K. Org. Lett. 2007, 9, 5031-5033.
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34247515321
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