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Volumn 2, Issue 11, 2010, Pages 1403-1406

Oxidative nickel-air catalysis in C-H arylation: Direct cross-coupling of Azoles with arylboronic acids using air as sole oxidant

Author keywords

Arylation; Boron; Heterocycles; Nickel; Oxidation

Indexed keywords


EID: 79551686845     PISSN: 18673880     EISSN: 18673899     Source Type: Journal    
DOI: 10.1002/cctc.201000223     Document Type: Article
Times cited : (82)

References (100)
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    • Limited successful examples:
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    • Reviews:
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    • Recent reviews:
    • Recent reviews:
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    • Selected examples:
    • Selected examples:
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    • Direct C-C bond formation from C-H bond with other organometallic reagents; Sn:
    • Direct C-C bond formation from C-H bond with other organometallic reagents; Sn:
  • 69
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    • Only one precedent for the oxidative direct arylation of electron-deficient arenes under palladium catalysis
    • Only one precedent for the oxidative direct arylation of electron-deficient arenes under palladium catalysis: Y. Wei, J. Kan, M. Wang, W. Su, M. Hong, Org. Lett. 2009, 11, 3346.
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    • Wei, Y.1    Kan, J.2    Wang, M.3    Su, W.4    Hong, M.5
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    • Recent advances in nickel-catalyzed direct coupling of heteroarenes with organic halides or pseudohalides:
    • Recent advances in nickel-catalyzed direct coupling of heteroarenes with organic halides or pseudohalides:
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    • 2, the reaction did not proceed at all, even in the presence of NaOtBu;
    • 2, the reaction did not proceed at all, even in the presence of NaOtBu; S. Yanagisawa, K. Ueda, T. Taniguchi, K. Itami, Org. Lett. 2008, 10, 4673.
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    • Even with the modified system, benzothiazole coupled sluggishly with 4-methylphenylboronic acid (2a) to furnish the arylated product in only 19% GC yield. The reactions with other heteroarenes such as benzimidazole and benzothiophene were unsuccessful.
    • Even with the modified system, benzothiazole coupled sluggishly with 4-methylphenylboronic acid (2a) to furnish the arylated product in only 19% GC yield. The reactions with other heteroarenes such as benzimidazole and benzothiophene were unsuccessful.
  • 78
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    • In general, the pinacolboronic esters showed lower reactivity to the parent boronic acids. For example, benzoxazole (1a) sluggishly coupled with 4-biphenylyl pinacolboronic ester under the standard conditions (ca.15% GC yield vs 3ad in Table2). However, in the case of the electron-deficient aryl groups, the activity of pinacol esters was comparable.
    • J. M. Murphy, X. Liao, J. F. Hartwig, J. Am. Chem. Soc. 2007, 129, 15434. In general, the pinacolboronic esters showed lower reactivity to the parent boronic acids. For example, benzoxazole (1a) sluggishly coupled with 4-biphenylyl pinacolboronic ester under the standard conditions (ca.15% GC yield vs 3ad in Table2). However, in the case of the electron-deficient aryl groups, the activity of pinacol esters was comparable.
    • (2007) J. Am. Chem. Soc. , vol.129 , pp. 15434
    • Murphy, J.M.1    Liao, X.2    Hartwig, J.F.3
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    • In the absence of phen, a somewhat lower yield (15%) of 5af was detected.
    • In the absence of phen, a somewhat lower yield (15%) of 5af was detected.
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    • Base-assisted cupration of heteroarenes:
    • Base-assisted cupration of heteroarenes:
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    • Indeed, in some cases, a detectable amount of phenol arising from arylboronic acid was detected by GC-MS, indicating the insitu formation of peroxide; palladium analogues:
    • Indeed, in some cases, a detectable amount of phenol arising from arylboronic acid was detected by GC-MS, indicating the insitu formation of peroxide; palladium analogues:


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.