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0037783927
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For recent examples of bipyridine ligands with planar chirality, see ref 10 and: (j) Wörsdorför, U.; Vögtle, F.; Nieger, M.; Waletzke, M.; Grimme, S.; Glorius, F.; Pfaltz, A. Synthesis 1999, 597.
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36
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0043193156
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PINene-Derived bipYridine
-
PINene-Derived bipYridine.
-
-
-
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37
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0025309685
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Brown, H. C.; Weissman, S. A.; Perumal, P. T.; Dhokte, U. P. J. Org. Chem. 1990, 55, 1217.
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0041690228
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Identical with the known compound: (a) Hall, H. K. J. Org. Chem. 1963, 28, 3213.
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For the method, see: Burk, M. J.; Casy, G.; Johnson, N. B. J. Org. Chem. 1998, 63, 6084.
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0043193154
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note
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19 However, in view of the cost of the former and the difficulties associated with the availability of the latter reagent, none of them was particularly suitable for large-scale operations.
-
-
-
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44
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37049133190
-
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For the Ti(III) and Cr(II) reduction, see: (a) Boar, R. B.; McGhie, J. F.; Robinson, M.; Barton, D. H. R.; Horwell, D. C.; Stick, R. V. J. Chem. Soc., Perkin Trans. 1 1975, 1237.
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0001682833
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47
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84978055185
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For the method of α-chloropyridine dimerization, see ref 6a and the following: (a) Dehmlow, E. V.; Sleegers, A. Liebigs Ann. Chem. 1992, 9, 953.
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(b) Brenner, E.; Schneider, R.; Fort, Y. Tetrahedron Lett. 2000, 41, 2881.
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49
-
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0042190943
-
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note
-
Although this coupling is, a priori, amenable to a catalytic process, reactions with sub-stoichiometric amounts (e.g., 10 mol %) of Ni(0) turned out to lead predominantly to the reduction product 7.
-
-
-
-
50
-
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0001159791
-
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For the preparation of Cu(II)-bipy complexes, see, e.g., ref 9 and the following: Bolm, C.; Ewald, M.; Zehnder, M.; Neuburger, M. A. Chem. Ber. 1992, 125, 453.
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Bolm, C.1
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51
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0042692077
-
-
note
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2) = 0.0973 for all data, Flack factor = 0.003(7). The estimated error in C-C bond lengths is in the range of 0.002-0.003 Å.
-
-
-
-
52
-
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0033603853
-
-
For a similar distortion, see ref 9. Several oxazoline-type Cu(II) complexes have also been reported to exhibit distortion at Cu (although not to the extend observed for 8). For a recent summary, see: (a) Evans, D. A.; Miller, S. J.; Lectka, T.; von Matt, P. J. Am. Chem. Soc. 1999, 121, 7559.
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53
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0033603850
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(b) Evans, D. A.; Barnes, D. M.; Johnson, J. S.; Lectka, T.; von Matt. P.; Miller, S. J.; Murry, J. A.; Norcross, R. D.; Shaughnessy, E. A.; Campos, K. R. J. Am. Chem. Soc. 1999, 121, 7582.
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Evans, D.A.1
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0034006954
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(c) Evans, D. A.; Johnson, J. S.; Olhava, E. J. J. Am. Chem. Soc. 2000, 122, 1635.
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(a) Gokhale, A. S.; Minidis, A. B. E.; Pfaltz, A. Tetrahedron Lett. 1995, 36, 1831.
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56
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0028931670
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(b) Andrus, M. A.; Argade, A. B.; Chen, X.; Pamment, M. G. Tetrahedron Lett. 1995, 36, 2945.
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Hamachi, K.1
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33748818574
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Sekar, G.1
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63
-
-
0042692052
-
-
note
-
6.
-
-
-
-
64
-
-
0041690198
-
-
note
-
3], its ultimate precursor 5 was found to be of 95% ee by HPLC.
-
-
-
-
65
-
-
0042190913
-
-
note
-
S = 13.8 min (major), UV detection at 220 nm.
-
-
-
-
66
-
-
0041690197
-
-
note
-
26
-
-
-
-
67
-
-
0043193130
-
-
note
-
For the role of the counterion in Cu(I)- and Cu(II)-catalyzed reactions, see, e.g., ref 25.
-
-
-
-
68
-
-
0042692051
-
-
note
-
Apparently, the reaction requires a trace of water since adding molecular sieves resulted in a dramatic deceleration (though the enantioselectivity remained essentially unaffected).
-
-
-
-
69
-
-
0042692049
-
-
note
-
26 have different "optimal substrates"; in the case of PINDY it is 11c that gives the highest enantioselectivity.
-
-
-
|