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Hatakeyama, S.1
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66149106003
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For the optimization of diastereoselectivity through screening of organometallic reagents and additives see refs 1b, 2c, 2d, and 2e
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For the optimization of diastereoselectivity through screening of organometallic reagents and additives see refs 1b, 2c, 2d, and 2e.
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22
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66149130019
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3 by filtration and concentration, the resulting aldehyde was used without further purification
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The tetrahydrofurfural 1 was prepared by ozonolysis of 8 followed by reductive workup with polymer-supported triphenylphosphine PS-PPhS 3, is described in the preceding manuscript
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3 by filtration and concentration, the resulting aldehyde was used without further purification. A full account of the synthesis of compound 1 is described in the preceding manuscript.
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A full account of the synthesis of compound
, vol.1
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23
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66149131172
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2O.
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2O.
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24
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0001897420
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For examples of Grignard reactions in CH2CI2, see: (a) Brown, D. S, Charreau, P, Ley, S. V. Synlett 1990, 749
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2, see: (a) Brown, D. S.; Charreau, P.; Ley, S. V. Synlett 1990, 749.
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26
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0026760195
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In the 1H NMR spectra of 10a and 10b (CDC1 3) the protons at CIO resonate at δ 3.40 and δ 3.76 ppm, respectively. These chemical shift values are consistent with those reported for threo and erythro diastereomers of α-substituted 2-tetrahydrofuranmethanols. For the use of this mnemonic in the configurational assignment of α-substituted 2-tetrahydrofuranmethanols, see: (a) Harmange, J.-C, Figadère, B, Cavé, A. Tetrahedron Lett. 1992, 33, 5749
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3) the protons at CIO resonate at δ 3.40 and δ 3.76 ppm, respectively. These chemical shift values are consistent with those reported for threo and erythro diastereomers of α-substituted 2-tetrahydrofuranmethanols. For the use of this mnemonic in the configurational assignment of α-substituted 2-tetrahydrofuranmethanols, see: (a) Harmange, J.-C.; Figadère, B.; Cavé, A. Tetrahedron Lett. 1992, 33, 5749.
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27
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0027275838
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(b) Gale, J. B.; Yu, J.-G.; Hu, X. E.; Khare, A.; Ho, D. K.; Cassady, J. M. Tetrahedron Lett. 1993, 34, 5847.
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Gale, J.B.1
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Cassady, J.M.6
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28
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66149109705
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2 (10 equiv), a considerable number of byproducts were formed and the observed ratio of 10a:10b differed only slightly from those reported in entries 9-11.
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2 (10 equiv), a considerable number of byproducts were formed and the observed ratio of 10a:10b differed only slightly from those reported in entries 9-11.
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29
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66149128929
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1H NMR spectra, see Supporting Information.
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1H NMR spectra, see Supporting Information.
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30
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0038730484
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For temperature and solvent effects in the diastereoselective addition of nucleophiles to carbonyl compounds, see: (a) Badorrey, R, Cativiela, C, Díaz-de-Villegas, M. D, Díez, R, Gálvez, J. A, Chem. 2003, 2268
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For temperature and solvent effects in the diastereoselective addition of nucleophiles to carbonyl compounds, see: (a) Badorrey, R.; Cativiela, C.; Díaz-de-Villegas, M. D.; Díez, R.; Gálvez, J. A. Eur. J. Org. Chem. 2003, 2268.
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(b) Cainelli, G.; Giacomini, D.; Galletti, P.; Orioli, P. Eur. J. Org. Chem. 2001, 4509.
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Cainelli, G.1
Giacomini, D.2
Galletti, P.3
Orioli, P.4
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33
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66149153168
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When a solution of 10a and 10b (8:1 mixture) in DCE was treated with EtMgBr and heated at reflux for 1 h, there was no change in the ratio of these substances. This result indicates that the diastereoselectivities summarized in Table lare not the result of a selective decomposition of 10b under the reaction conditions.
-
When a solution of 10a and 10b (8:1 mixture) in DCE was treated with EtMgBr and heated at reflux for 1 h, there was no change in the ratio of these substances. This result indicates that the diastereoselectivities summarized in Table lare not the result of a selective decomposition of 10b under the reaction conditions.
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34
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0028326087
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For examples of inverse temperature dependence in Grignard additions to aldehdyes see ref 3a and Markó, I. E, Chesney, A, Hollinshead, D. M. Tetrahedron: Asymmetry 1994, 5, 569
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For examples of inverse temperature dependence in Grignard additions to aldehdyes see ref 3a and Markó, I. E.; Chesney, A.; Hollinshead, D. M. Tetrahedron: Asymmetry 1994, 5, 569.
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35
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2O.
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2O.
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36
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0000415601
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For a detailed description of chelation controlled Grignard additions, see
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For a detailed description of chelation controlled Grignard additions, see: Eliel, E. L.; Frye, S. V.; Hortelano, E. R.; Chen, X.; Bai, X. Pure Appl. Chem. 1991, 63, 1591.
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42449132925
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For discussions regarding temperature-dependent effects in stereo-selective synthesis, see: a
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For discussions regarding temperature-dependent effects in stereo-selective synthesis, see: (a) Sivaguru, J.; Solomon, M. R.; Poon, T.; Jockusch, S.; Bosio, S.; Adam, W.; Turro, N. J. Acc. Chem. Res. 2008, 41, 387.
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For discussions regarding inverse-temperature-dependent effects and the isoinversion princple, see: a
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Buschamnn, H.1
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60
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66149146375
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2Mg (1 M solution in heptane) to a solution of 1 in DCE at room temperature provided (in low yield) a 1.3:1 mixture of diastereomeric alcohols favoring the 10S diastereomer, along with a number of byproducts.
-
2Mg (1 M solution in heptane) to a solution of 1 in DCE at room temperature provided (in low yield) a 1.3:1 mixture of diastereomeric alcohols favoring the 10S diastereomer, along with a number of byproducts.
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61
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66149119494
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2O (1.8:1). In DCE, the ratio of 10R:10S diastereomers (2.3:1) was unchanged when the addition was carried out at temperatures ranging from room temperature to 83 °C.
-
2O (1.8:1). In DCE, the ratio of 10R:10S diastereomers (2.3:1) was unchanged when the addition was carried out at temperatures ranging from room temperature to 83 °C.
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62
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66149086648
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See Supporting Information for theoretical references as well as a comprehensive explanation of methods used to locate the transition states
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See Supporting Information for theoretical references as well as a comprehensive explanation of methods used to locate the transition states.
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