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Volumn 7, Issue 17, 2009, Pages 3584-3593

The enantioselective benzoin condensation promoted by chiral triazolium precatalysts: Stereochemical control via hydrogen bonding

Author keywords

[No Author keywords available]

Indexed keywords

AROMATIC ALDEHYDE; BENZOIN CONDENSATION; CATALYST EVALUATION; CATALYTIC CYCLES; ENANTIOSELECTIVE; HYDROGEN BONDINGS; PRECATALYSTS; STEREOCHEMICAL CONTROL;

EID: 70349286053     PISSN: 14770520     EISSN: None     Source Type: Journal    
DOI: 10.1039/b908517c     Document Type: Article
Times cited : (57)

References (40)
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    • Recent reviews:
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    • (1840) Ann. Pharm. , vol.34 , pp. 329
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  • 12
  • 15
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    • Rawal later improved the yield of this process substantially to 48%:
    • J. Sheehan T. Hara J. Org. Chem. 1974 39 1196
    • (1974) J. Org. Chem. , vol.39 , pp. 1196
    • Sheehan, J.1    Hara, T.2
  • 29
    • 38949191992 scopus 로고    scopus 로고
    • For related references concerning the enantioselective carbene-catalysed intramolecular benzoin condensation see:
    • T. Rovis Chem. Lett. 2008 2
    • (2008) Chem. Lett. , vol.2
    • Rovis, T.1
  • 31
    • 34547424960 scopus 로고    scopus 로고
    • Very recently, You et al. reported a bis-triazolium precatalyst which was capable of promoting highly enantioselective benzoin condensation reactions:
    • H. Takikawa K. Suzuki Org. Lett. 2007 9 2713
    • (2007) Org. Lett. , vol.9 , pp. 2713
    • Takikawa, H.1    Suzuki, K.2
  • 39
    • 37049142015 scopus 로고
    • 1H NMR spectroscopy) for a significant conformational discrepancy between 15a and 16. In addition it is noteworthy that 15a and 16 display almost identical reactivity under these conditions and that all of the secondary amide catalysts evaluated promoted more selective reactions than 16. This we feel is best explained by the intermediacy of hydrogen-bonded species using precatalyst 15a
    • G. V. Boyd A. J. H. Summers J. Chem. Soc. (C) 1971 409
    • (1971) J. Chem. Soc. (C) , pp. 409
    • Boyd, G.V.1    Summers, A.J.H.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.