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0343682058
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(a) From α-alkoxyorganostannanes: ref 2.
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23
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(d) Matteson, D. S.; Soundararajan, R.; Ho, O. C.; Gatzweiler, W. Organometallics 1996, 15, 152-163.
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(b) Matteson, D. S.; Ray, R.; Rocks, R. R.; Tsai, D. J. Organometallics 1983, 2, 1536-1543.
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(b) Brown, H. C.; Singh, S. M.; Rangaishenvi, M. V. J. Org. Chem. 1986, 51, 3150-3155. (Bromomethyl)lithium: Michnick, T. J.; Matteson, D. S. Synlett 1991, 631-632. (Iodomethyl)lithium: Wallace, R. H.; Zong, K. K. Tetrahedron Lett. 1992, 33, 6941-6944.
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(b) Brown, H. C.; Singh, S. M.; Rangaishenvi, M. V. J. Org. Chem. 1986, 51, 3150-3155. (Bromomethyl)lithium: Michnick, T. J.; Matteson, D. S. Synlett 1991, 631-632. (Iodomethyl)lithium: Wallace, R. H.; Zong, K. K. Tetrahedron Lett. 1992, 33, 6941-6944.
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Michnick, T.J.1
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(b) Brown, H. C.; Singh, S. M.; Rangaishenvi, M. V. J. Org. Chem. 1986, 51, 3150-3155. (Bromomethyl)lithium: Michnick, T. J.; Matteson, D. S. Synlett 1991, 631-632. (Iodomethyl)lithium: Wallace, R. H.; Zong, K. K. Tetrahedron Lett. 1992, 33, 6941-6944.
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Wallace, R.H.1
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0028081123
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For a comparative study of different (halomethyl)lithiums, see: (a) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8957-8960.
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(b) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8961-8964. (1,1-Dichloroethyl)lithium: Matteson, D. S.; Hurst, G. D. Heteroatom Chem. 1990, 1, 65-74. [(Chloroaryl)-methyl]lithium: Kabalka, G. W.; Li, N.-S.; Yu, S. Tetrahedron: Asymmetry 1997, 8, 3843-3846.
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(b) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8961-8964. (1,1-Dichloroethyl)lithium: Matteson, D. S.; Hurst, G. D. Heteroatom Chem. 1990, 1, 65-74. [(Chloroaryl)-methyl]lithium: Kabalka, G. W.; Li, N.-S.; Yu, S. Tetrahedron: Asymmetry 1997, 8, 3843-3846.
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(b) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8961-8964. (1,1-Dichloroethyl)lithium: Matteson, D. S.; Hurst, G. D. Heteroatom Chem. 1990, 1, 65-74. [(Chloroaryl)-methyl]lithium: Kabalka, G. W.; Li, N.-S.; Yu, S. Tetrahedron: Asymmetry 1997, 8, 3843-3846.
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For reviews, see: (a) Matteson. D. S. Tetrahedron 1998, 54, 10555-10607.
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Matteson, D.S.1
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0343246424
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(b) Reference 14a, Chapter 5.
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48
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Shiner, C. S.; Tsunoda, T.; Goodman, B. A.; Ingham, S.; Lee, S.-H.; Vorndam, P. E. J. Am. Chem. Soc. 1989, 111, 1381-1392.
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55
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84878585406
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The Chemical Abstracts name for (+)-or (S)-pinanediol is [1S-(1α,2β,3β,5α)]-2,6,6-trimethylbicyclo[3.1.1]heptane-2, 3-diol.
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Chemical Abstracts
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56
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0342811751
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note
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The same chemical shift was observed when 4a was treated with lithium ethoxide in THF.
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0343682040
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The same NMR study was realized with the (+)-pinanediol methylboronate 1g. The migration of the methyl group was observed at an upper temperature to -60°C.
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60
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0343246419
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An excess of zinc chloride is also required during the Matteson homologation with compounds containing oxygen functionality. Reference 8a.
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0342811747
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A mixture of 4a, lithium ethoxide and zinc chloride in THF was stirred overnight at room temperature. No detectable epimerization is observed only a small degradation of the product (∼2%).
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Systematic names of 4: 4a, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy) phenylmethyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4b, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)(4- bromophenyl)methyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2- benzodioxaborole; 4c, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)(1- naphthyl)methyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4e, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)-2- methylethyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4f, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)-heptyl] hexahydro-3a,5,5-trimethyl-4,6-methano-1,3,2-benzodioxaborole; 4g, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)ethyl] hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4h, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(methoxy) phenylmethyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4i, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(methoxy)ethyl] hexahydro-3a,5,5-trimethyl-4,6-methano-1,3,2-benzodioxaborole. The 3aS designates the absolute configuration of the entire molecule by reference to carbon 3a. The 2(R*) indicates that this is the enantiomer in which the side chain at position 2 would have the R configuration if position 3a were R, but since position 3a is S, the side chain is S.
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63
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0343246415
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7a with lithium ethoxide.
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64
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0343682037
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note
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The α-ethoxy derivative 4d was obtained from the (+)-pinanediol 1-hexenylboronate without Lewis acid in 14% de, yield 50%.
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65
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0342376840
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No quantitative study of migratory aptitudes was carried out in homologation reaction, contrary to the oxidative deboronation. However, certain brief replies are given in the ref 15a.
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Tsai, D. J. S.; Jesthi, P. K.; Matteson, D. S. Organometallics 1983, 2, 1543-1545.
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Brown, H. C.; Srebnik, M.; Cole, T. E. Organometallics 1986, 5, 2300-2303.
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Matteson, D. S.; Jesthi, P. K.; Sadhu, K. M. Organometallics 1984, 3, 1284-1288.
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