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For recent reports on the total syntheses of natural products via carbonyl ylide cycloaddition strategy, see: (a) Nakamura, S.; Hirata, Y.; Kurosaki, T.; Anada, M.; Kataoka, O.; Kitagaki, S.; Hashimoto, S. Angew. Chem., Int. Ed. 2003, 42, 5351-5355.
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Suga and co-workers developed a conceptually different approach and demonstrated highly enantioselective 1,3-dipolar cycloadditions of 2-benzopyrylium-4-olates with a variety of dipolarophiles using chiral Lewis acid catalysts: (a) Suga, H, Inoue, K, Inoue, S, Kakehi, A. J. Am. Chem. Soc. 2002, 124, 14836-14837
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Suga and co-workers developed a conceptually different approach and demonstrated highly enantioselective 1,3-dipolar cycloadditions of 2-benzopyrylium-4-olates with a variety of dipolarophiles using chiral Lewis acid catalysts: (a) Suga, H.; Inoue, K.; Inoue, S.; Kakehi, A. J. Am. Chem. Soc. 2002, 124, 14836-14837.
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For seminal works on enantioselective intermolecular cycloadditon of carbonyl ylides using chiral dirhodium(II) catalyst, see: (a) Doyle, M. P.; Forbes, D. C. Chem. Rev. 1998, 98, 911-935.
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Kitagaki, S.; Anada, M.; Kataoka, O.; Matsuno, K.; Umeda, C.; Watanabe, N.; Hashimoto, S. J. Am. Chem. Soc. 1999, 121, 1417-1418.
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For the effective use of 1g,h in enantioselective aminations and aromatic C-H insertions, see: (a) Yamawaki, M.; Tsutsui, H.; Kitagaki, S.; Anada, M.; Hashimoto, S. Tetrahedron Lett. 2002, 43, 9561-9564.
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49
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61349204353
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Hodgson and co-workers reported that the reaction of 4a with 5a (10 equiv) under the influence of 1 mol, of Rh2(R- DDBNP)4 (3) in hexane at 25 °C provided cycloadduct 6a in 41% yield with 61% ee. See ref 13
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4 (3) in hexane at 25 °C provided cycloadduct 6a in 41% yield with 61% ee. See ref 13.
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50
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61349112546
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The preferred absolute stereochemistry of cycloadducts was not determined
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The preferred absolute stereochemistry of cycloadducts was not determined.
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51
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33750926806
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4, was developed by Reddy and Davies: Reddy, R. P.; Davies, H. M. L. Org. Lett. 2006, 8, 5013-5016.
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4, was developed by Reddy and Davies: Reddy, R. P.; Davies, H. M. L. Org. Lett. 2006, 8, 5013-5016.
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52
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61349101633
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2, 14% yield, 40% ee.
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2, 14% yield, 40% ee.
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53
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61349134604
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For the orbital correlation diagram, see the Supporting Information
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For the orbital correlation diagram, see the Supporting Information.
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54
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61349149149
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The use of p-nitrophenylacetylene as a strongly electron-deficient dipolarophile resulted in 17% yield of cycloadduct with 72% ee.
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The use of p-nitrophenylacetylene as a strongly electron-deficient dipolarophile resulted in 17% yield of cycloadduct with 72% ee.
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55
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61349196667
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Hodgson and co-workers reported that the reaction of 4a with 7a (10 equiv) under Rh2(OAc)4 catalysis in CH 2Cl2 at 20 °C afforded a 2:1 mixture of exo and endo cycloadducts in 53% yield, while the use of Rh2(S-DOSP)4 (2) in hexane at 20 °C increased exo diastereoselectivity (exo: endo, 10:1, 73% yield) and provided 61% ee for exo cycloadduct 8a. See ref 13b
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4 (2) in hexane at 20 °C increased exo diastereoselectivity (exo: endo = 10:1, 73% yield) and provided 61% ee for exo cycloadduct 8a. See ref 13b.
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56
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61349188135
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4 was less effective for the reaction of 4a with DMAD, giving the corresponding cycloadduct in 60% yield with 40% ee.
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4 was less effective for the reaction of 4a with DMAD, giving the corresponding cycloadduct in 60% yield with 40% ee.
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57
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35548978110
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Very recently, Suga and co-workers have reported highly enantioselective dipole-LUMO/dipolarophile-HOMO controlled cycloadditions between 2-benzopyrylium-4-olates and vinyl ether derivatives using chiral Lewis acid catalysts: Suga, H.; Ishimoto, D.; Higuchi, S.; Ohtsuka, M.; Arikawa, T.; Tsuchida, T.; Kakehi, A.; Baba, T. Org. Lett. 2007, 9, 4359-4362.
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Very recently, Suga and co-workers have reported highly enantioselective dipole-LUMO/dipolarophile-HOMO controlled cycloadditions between 2-benzopyrylium-4-olates and vinyl ether derivatives using chiral Lewis acid catalysts: Suga, H.; Ishimoto, D.; Higuchi, S.; Ohtsuka, M.; Arikawa, T.; Tsuchida, T.; Kakehi, A.; Baba, T. Org. Lett. 2007, 9, 4359-4362.
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