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Volumn 121, Issue 18, 1999, Pages 4369-4378

Novel electron-rich bulky phosphine ligands facilitate the palladium- catalyzed preparation of diaryl ethers

Author keywords

[No Author keywords available]

Indexed keywords

DIARYL ETHER; ETHER DERIVATIVE; HALOGENATED HYDROCARBON; LIGAND; PALLADIUM; PHENOL DERIVATIVE; PHOSPHINE DERIVATIVE; SULFONIC ACID DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0033549049     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja990324r     Document Type: Article
Times cited : (534)

References (78)
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    • For reviews, see: (a) Wolfe, J. P.; Wagaw, S.; Marcoux, J.-F.; Buchwald, S. L. Acc. Chem. Res. 1998, 31, 805-818. (b) Hartwig, J. F. Angew. Chem., Int. Ed. 1998, 37, 2046-2067. (c) Hartwig, J. F. Synlett 1997, 329-340. (d) Hartwig, J. F. Acc. Chem. Res. 1998, 31, 852-860. (e) Yang, B. H.; Buchwald, S. L. J. Organomet. Chem., in press.
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    • For reviews, see: (a) Wolfe, J. P.; Wagaw, S.; Marcoux, J.-F.; Buchwald, S. L. Acc. Chem. Res. 1998, 31, 805-818. (b) Hartwig, J. F. Angew. Chem., Int. Ed. 1998, 37, 2046-2067. (c) Hartwig, J. F. Synlett 1997, 329-340. (d) Hartwig, J. F. Acc. Chem. Res. 1998, 31, 852-860. (e) Yang, B. H.; Buchwald, S. L. J. Organomet. Chem., in press.
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    • in press
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    • For other examples of bulky, electron-rich ligands for Pd-catalyzed carbon-heteroatom bond forming reactions, see: (a) Nishiyama, M.; Yamamoto, T.; Koie, Y. Tetrahedron Lett. 1998, 39, 617-620. (b) Yamamoto, M.; Nishiyama, M.; Koie, Y. Tetrahedron Lett. 1998, 39, 2367- 2370. (c) Reddy, N. P.; Tanaka, M. Tetrahedron Lett. 1998, 39, 617-620. (d) Hamann, B. C.; Hartwig, J. F. J. Am. Chem. Soc. 1998, 120, 7369- 7370. (e) Old, D. W.; Wolfe, J. P.; Buchwald, S. L. J. Am. Chem. Soc. 1998, 120, 9722-9723.
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    • Typically, oxidative addition of aryl chlorides to Pd(0) requires temperatures of 60-140°C. (a) Grushin, V. V.; Alper, H. Chem. Rev. 1994, 94, 1047-1062. (b) Hermann, W. A.; Brossmer, C.; Priermeier, T.; Öfele, K. J. Organomet. Chem. 1994, 481, 97-108. (c) Parshall, G. W. J. Am. Chem. Soc. 1974, 96, 2360-2366. (d) Huser, M.; Youinou, M.-T.; Osborn, J. A. Angew. Chem., Int. Ed. 1989, 28, 1386-1388.
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    • Typically, oxidative addition of aryl chlorides to Pd(0) requires temperatures of 60-140°C. (a) Grushin, V. V.; Alper, H. Chem. Rev. 1994, 94, 1047-1062. (b) Hermann, W. A.; Brossmer, C.; Priermeier, T.; Öfele, K. J. Organomet. Chem. 1994, 481, 97-108. (c) Parshall, G. W. J. Am. Chem. Soc. 1974, 96, 2360-2366. (d) Huser, M.; Youinou, M.-T.; Osborn, J. A. Angew. Chem., Int. Ed. 1989, 28, 1386-1388.
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    • Prentice Hall: Upper Saddle River, New Jersey
    • (a) It is well-known that the use of electron-rich phosphine ligands accelerates the rate of oxidative addition of aryl halides to Pd(0). See: Spessard, G. O.; Meissler, G. L. Organometallic Chemistry; Prentice Hall: Upper Saddle River, New Jersey, 1996; pp 171-175.
    • (1996) Organometallic Chemistry , pp. 171-175
    • Spessard, G.O.1    Meissler, G.L.2
  • 38
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    • 2 (dippp = 1,3-bis(diisopropylphosphino)propane) at 38°C. Portnoy, M.; Milstein, D. Organometallics 1993, 12, 1665-1673.
    • (1993) Organometallics , vol.12 , pp. 1665-1673
    • Portnoy, M.1    Milstein, D.2
  • 42
    • 0030758961 scopus 로고    scopus 로고
    • (d) Hillhouse has reported C-O bond forming reductive elimination from nickel complexes. Han, R.; Hillhouse, G. L. J. Am. Chem. Soc. 1997, 119, 8135-8136.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 8135-8136
    • Han, R.1    Hillhouse, G.L.2
  • 45
    • 0345412188 scopus 로고    scopus 로고
    • note
    • We have previously speculated that improved results in Pd-catalyzed aryl C-O bond forming reactions might be obtained with the use of bulky, electron-deficient, chelating phosphine ligands; see ref 6b.
  • 46
    • 0344549945 scopus 로고    scopus 로고
    • note
    • Di-tert-butylchlorophosphine is the bulkiest dialkylchlorophosphine which is commercially available.
  • 47
    • 0344980904 scopus 로고
    • Schlosser, M., Ed.; John Wiley and Sons: Chichester
    • Schlosser, M. in Organometallics in Synthesis; Schlosser, M., Ed.; John Wiley and Sons: Chichester, 1994; pp 129-133.
    • (1994) Organometallics in Synthesis , pp. 129-133
    • Schlosser, M.1
  • 48
    • 33845376366 scopus 로고
    • Premixing of sodium hydride and the phenol is required to avoid palladium-catalyzed hyride reduction of the aryl halide; Pd-catalyzed reduction of vinyl triflates by LiH and KH has been previously observed: Scott, W. J.; Stille, J. K. J. Am. Ckem. Soc., 1986, 108, 3033-3040.
    • (1986) J. Am. Ckem. Soc. , vol.108 , pp. 3033-3040
    • Scott, W.J.1    Stille, J.K.2
  • 49
    • 0345412163 scopus 로고    scopus 로고
    • note
    • 8e we employed dicylclohexylphenylphosphine in a control reaction due the commercial availability of this compound.
  • 50
    • 0344549942 scopus 로고    scopus 로고
    • note
    • Control experiments were carried out in the absence of a palladium salt. For the reaction of 4-bromoacetophenone and phenol with potassium phosphate in toluene at 100°C, none of the desired product was detected; in DMF at 100°C, 32% (GC, corrected) of the starting halide was consumed, and a 5% GC yield of the desired product was observed.
  • 51
    • 0345412162 scopus 로고    scopus 로고
    • note
    • An exception is the reaction of 2-bromobenzotrifluoride and o-cresol to provide the corresponding diaryl ether in 75% isolated yield; the reaction of 2-bromoacetophenone and o-cresol proceeded to 25% conversion (GC) with ligand 4, affording <20% of the desired product.
  • 52
    • 0344549935 scopus 로고    scopus 로고
    • note
    • Yields are typically 15-20% higher, and improved product/arene ratio is observed.
  • 53
    • 0344118292 scopus 로고    scopus 로고
    • note
    • nPd(Ar)X complexes has been shown to occur at room temperature when L = BINAP or DPPF.; see ref 6d, 11b-c.
  • 55
    • 0344549941 scopus 로고    scopus 로고
    • note
    • We cannot rule out a situation where not all of the palladium is ligated in the reaction mixture and the reactions are proceeding through bis(phosphine) intermediates.
  • 61
    • 0037955086 scopus 로고
    • Hartwig has proposed a similar mechanism to account for electronic effects in C-S and C-N bond forming reductive elimination reactions. (a) Baranano, D.; Hartwig, J. F. J. Am. Chem. Soc. 1995, 117, 2937-2938. (b) Driver, M. S.; Hartwig, J. F. J. Am. Chem. Soc. 1997, 119, 8232- 8245.
    • (1995) J. Am. Chem. Soc. , vol.117 , pp. 2937-2938
    • Baranano, D.1    Hartwig, J.F.2
  • 62
    • 0030864744 scopus 로고    scopus 로고
    • Hartwig has proposed a similar mechanism to account for electronic effects in C-S and C-N bond forming reductive elimination reactions. (a) Baranano, D.; Hartwig, J. F. J. Am. Chem. Soc. 1995, 117, 2937-2938. (b) Driver, M. S.; Hartwig, J. F. J. Am. Chem. Soc. 1997, 119, 8232-8245.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 8232-8245
    • Driver, M.S.1    Hartwig, J.F.2
  • 65
    • 0344118289 scopus 로고    scopus 로고
    • note
    • We thank Dr. Joseph Fox for this suggestion.
  • 68
    • 0345412157 scopus 로고    scopus 로고
    • note
    • This compound is also available from Aldrich Chemical Co.
  • 73
    • 0344549932 scopus 로고
    • Horii, Z.; Kiuchi, T. J. Pharm. Soc. Jpn. 1937, 57, 683-688; Chem. Abstr. 1938, 129.
    • (1938) Chem. Abstr. , pp. 129
  • 78
    • 0343221534 scopus 로고
    • Fujikawa, F.; Nakamura, I. J. Pharm. Soc. Jpn. 1944, 64, 274- 276; Chem. Abstr. 1951, 2906.
    • (1951) Chem. Abstr. , pp. 2906


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