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For a nickel-catalyzed coupling of allenyl aldehydes and alkylzincs, see: (a) Montgomery, J.; Song, M. Org. Lett. 2002, 4, 4009-4011. Attempted intermolecular three-component coupling with an arylzinc afforded benzylic alcohols via a direct addition of arylzincs to aldehydes, see: (b) Montgomery, J.; Oblinger, E. J. Am. Chem. Soc. 1997, 119, 9065-9066. An example of a nickel-catalyzed coupling of boronic acids with alkynes and imines yielding allylic amines is known; see: (c) Patel, S. J.; Jamison, T, F. Angew. Chem., Int. Ed. 2003, 42, 1364-1367. For additional related nickel-catalyzed multicomponent coupling reactions, see: (d) Molinary, C.; Jamison, T. F. J. Am. Chem. Soc. 2003, 125, 8076-8077. (e) Montgomery, J. Acc. Chem. Res. 2000, 33, 467-473. (f) Mori, M.; Takimoto, M.; Sato, Y. J. Am. Chem. Soc. 2000, 122, 1624-1634. (g) Ikeda, S.-I. Angew. Chem., Int. Ed. 2003, 42, 5120-5122.
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For a nickel-catalyzed coupling of allenyl aldehydes and alkylzincs, see: (a) Montgomery, J.; Song, M. Org. Lett. 2002, 4, 4009-4011. Attempted intermolecular three-component coupling with an arylzinc afforded benzylic alcohols via a direct addition of arylzincs to aldehydes, see: (b) Montgomery, J.; Oblinger, E. J. Am. Chem. Soc. 1997, 119, 9065-9066. An example of a nickel-catalyzed coupling of boronic acids with alkynes and imines yielding allylic amines is known; see: (c) Patel, S. J.; Jamison, T, F. Angew. Chem., Int. Ed. 2003, 42, 1364-1367. For additional related nickel-catalyzed multicomponent coupling reactions, see: (d) Molinary, C.; Jamison, T. F. J. Am. Chem. Soc. 2003, 125, 8076-8077. (e) Montgomery, J. Acc. Chem. Res. 2000, 33, 467-473. (f) Mori, M.; Takimoto, M.; Sato, Y. J. Am. Chem. Soc. 2000, 122, 1624-1634. (g) Ikeda, S.-I. Angew. Chem., Int. Ed. 2003, 42, 5120-5122.
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For a nickel-catalyzed coupling of allenyl aldehydes and alkylzincs, see: (a) Montgomery, J.; Song, M. Org. Lett. 2002, 4, 4009-4011. Attempted intermolecular three-component coupling with an arylzinc afforded benzylic alcohols via a direct addition of arylzincs to aldehydes, see: (b) Montgomery, J.; Oblinger, E. J. Am. Chem. Soc. 1997, 119, 9065-9066. An example of a nickel-catalyzed coupling of boronic acids with alkynes and imines yielding allylic amines is known; see: (c) Patel, S. J.; Jamison, T, F. Angew. Chem., Int. Ed. 2003, 42, 1364-1367. For additional related nickel-catalyzed multicomponent coupling reactions, see: (d) Molinary, C.; Jamison, T. F. J. Am. Chem. Soc. 2003, 125, 8076-8077. (e) Montgomery, J. Acc. Chem. Res. 2000, 33, 467-473. (f) Mori, M.; Takimoto, M.; Sato, Y. J. Am. Chem. Soc. 2000, 122, 1624-1634. (g) Ikeda, S.-I. Angew. Chem., Int. Ed. 2003, 42, 5120-5122.
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For a nickel-catalyzed coupling of allenyl aldehydes and alkylzincs, see: (a) Montgomery, J.; Song, M. Org. Lett. 2002, 4, 4009-4011. Attempted intermolecular three-component coupling with an arylzinc afforded benzylic alcohols via a direct addition of arylzincs to aldehydes, see: (b) Montgomery, J.; Oblinger, E. J. Am. Chem. Soc. 1997, 119, 9065-9066. An example of a nickel-catalyzed coupling of boronic acids with alkynes and imines yielding allylic amines is known; see: (c) Patel, S. J.; Jamison, T, F. Angew. Chem., Int. Ed. 2003, 42, 1364-1367. For additional related nickel-catalyzed multicomponent coupling reactions, see: (d) Molinary, C.; Jamison, T. F. J. Am. Chem. Soc. 2003, 125, 8076-8077. (e) Montgomery, J. Acc. Chem. Res. 2000, 33, 467-473. (f) Mori, M.; Takimoto, M.; Sato, Y. J. Am. Chem. Soc. 2000, 122, 1624-1634. (g) Ikeda, S.-I. Angew. Chem., Int. Ed. 2003, 42, 5120-5122.
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Palladium-catalyzed indium-mediated intermolecular coupling of aryl iodides and aldehydes with n-octylallene afforded linear homoallylic alcohols, see: (c) Anwar, U.; Rasparini, M.; Savic, V.; Sridharan, V.; Grigg, R. Chem. Commun. 2000, 645-646. In contrast, analogous transformation with allenes possessing heteroatom-containing substituents afforded branched alcohols; see: (d) Cleghorn, L. A. T.; Cooper, I. R.; MacLachlan, W. S.; Sridharan, V.; Grigg, R. Tetrahedron Lett. 2003, 44, 7969-7973.
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Following an "unproductive" transfer of the 2-propenyl group in the first turnover, catalyst 1a was expected to yield the symmetrical bisπ-allylpalladium complex VII (Figure 1).
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32
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3142717412
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Under conditions A, but in the absence of catalyst 1a, addition of allyltributyltin failed to afford any homoallylic alcohol, indicating that a hypothetical in situ formation of an allylstannane, followed by its uncatalyzed addition to benzaldehyde, was not a viable pathway to alcohol 5a. In contrast, uncatalyzed additions of allylboronic acids to aldehydes are known to be facile; see: Brown, H. C.; Racherla, U. S.; Pellechia, P. J. J. Org. Chem. 1990, 55, 1866-1874.
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3 present in reaction mixtures containing bis-π-allylpalladium complexes and aldehydes was found to promote an allylallyl coupling; see: Nakamura, H.; Bao, M.; Yamamoto, Y. Angew. Chem., Int. Ed. 2001, 40, 3208-3210.
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3142682248
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note
-
H1-H2 = 8-50 Hz in the minor diastereomer 5b) were consistent with dihedral angles anticipated in the most stable conformations of syn and anti diastereomers of alcohol 5, respectively.
-
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-
-
36
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3142730596
-
-
note
-
H1-H2 = 4.88 Hz was reported; see: ref 8f.
-
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37
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0035831228
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note
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For the effect of substitution on the relative transfer abilities of allyl ligands in bis-π-allylpalladium complexes, see: (a) Reference 3. (b) Solin, N.; Narayan, S.; Szabó, K. J. J. Org. Chem. 2001, 66, 1686-1693.
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38
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0035831228
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For the effect of substitution on the relative transfer abilities of allyl ligands in bis-π-allylpalladium complexes, see: (a) Reference 3. (b) Solin, N.; Narayan, S.; Szabó, K. J. J. Org. Chem. 2001, 66, 1686-1693.
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(l 8) For asymmetric allylation of imines catalyzed by analogues of complex 1b, see: (a) Fernandes, R. A.; Stimac, A.; Yamamoto, Y. J. Am. Chem. Soc. 2003, 125, 14133-14139. (b) Nakamura, H.; Nakamura, K.; Yamamoto, Y. J. Am. Chem. Soc. 1998, 120, 4242-4243.
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(l 8) For asymmetric allylation of imines catalyzed by analogues of complex 1b, see: (a) Fernandes, R. A.; Stimac, A.; Yamamoto, Y. J. Am. Chem. Soc. 2003, 125, 14133-14139. (b) Nakamura, H.; Nakamura, K.; Yamamoto, Y. J. Am. Chem. Soc. 1998, 120, 4242-4243.
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3142658722
-
-
note
-
3 (Pd:P, 1:1) limited the yields of alcohols 5 to 6% and 9%, respectively, although precipitation of Pd(0) was eliminated.
-
-
-
-
44
-
-
3142758551
-
-
note
-
In asymmetric allylations of imines, catalyst 1b proved to be less effective than its more substituted derivatives; see: ref 18b.
-
-
-
-
45
-
-
3142663187
-
-
note
-
1H NMR spectra of alcohol 10, the syn/anti assignments for 10 remain tentative.
-
-
-
-
46
-
-
3142758550
-
-
note
-
Determined by chiral-phase HPLC.
-
-
-
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47
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0000405384
-
-
(a) In allylations catalyzed by bis-π-allylpalladium complexes, prior coordination of electrophiles to palladium was proposed to occur under "phosphine free" conditions; see references 3 and 8b. Lower diastereoselectivity for the anti product was noted in analogous allylations in the presence of phosphine; see: Wallner, O. A.; Szabó, K. J. Org. Lett. 2002, 4, 1563-1566.
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(c) For allylations via "open" transition states yielding syn products, see: Hayashi, T.; Kabeta, K.; Hamachi, I.; Kumada, M. Tetrahedron Lett. 1983, 24, 2865-2868.
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3142737978
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note
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3B) is known; see reference 8d.
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50
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0042969402
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(a) Soling, N.; Kjellgren, J.; Szabó, K. J. Angew. Chem., Int. Ed. 2003, 42, 3656-3658.
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|