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Volumn 7, Issue 12, 2005, Pages 2453-2456

N-heterocyclic carbene-catalyzed amidation of unactivated esters with amino alcohols

Author keywords

[No Author keywords available]

Indexed keywords

AMINOALCOHOL; CARBENOID; ESTER DERIVATIVE; HETEROCYCLIC COMPOUND;

EID: 20544443754     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol050773y     Document Type: Article
Times cited : (288)

References (71)
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    • 0001595852 scopus 로고
    • For reviews on transesterification, see: (a) Otera, J. Chem. Rev. 1993, 93, 1449-1470.
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  • 13
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    • For catalytic condensation of carboxylic acids and alcohols, see: (c) Ishihara, K.; Ohara, S.; Yamamoto, H. Science 2000, 290, 1140-1142.
    • (2000) Science , vol.290 , pp. 1140-1142
    • Ishihara, K.1    Ohara, S.2    Yamamoto, H.3
  • 36
    • 0037043180 scopus 로고    scopus 로고
    • For reviews, see: (f) List, B. Tetrahedron 2002, 58, 5573-5590.
    • (2002) Tetrahedron , vol.58 , pp. 5573-5590
    • List, B.1
  • 48
    • 17444417515 scopus 로고    scopus 로고
    • (g) For resolution of alcohols using vinyl esters, see: Kano, T.; Sasaki, K.; Maruoka, K. Org. Lett. 2005, 7, 1347-1349.
    • (2005) Org. Lett. , vol.7 , pp. 1347-1349
    • Kano, T.1    Sasaki, K.2    Maruoka, K.3
  • 49
    • 20544468612 scopus 로고    scopus 로고
    • note
    • (a) In the absence of 3, incubation of equimolar amounts of esters 1a and 1b with 2a at 23°C provides less than 2 and 1%, respectively, of the corresponding amides in 12 h.
  • 50
    • 20544459733 scopus 로고    scopus 로고
    • See Supporting Information
    • tbutoxide in place of IMes (3) in the coupling of 1a and 2a gave 60 and 74% yield of 4aa, respectively. See Supporting Information.
  • 51
    • 20544458216 scopus 로고    scopus 로고
    • note
    • Introduction of anhydrous lithium chloride (5 mol %) to the reaction mixture increases the rate of this coupling (Table 1, entries 2, 7, and 13).
  • 52
    • 20544476352 scopus 로고    scopus 로고
    • note
    • N-Fmoc-protected glycine methyl ester was found to undergo deprotection in the presence of either 3 or 2a.
  • 53
    • 20544468348 scopus 로고    scopus 로고
    • See Supporting Information for details
    • See Supporting Information for details.
  • 56
    • 20544466812 scopus 로고    scopus 로고
    • note
    • 8.
  • 58
    • 20544453436 scopus 로고    scopus 로고
    • note
    • 6, 20 °C) are found at 219.4, and 120.9 ppm, respectively.
  • 59
    • 20544478551 scopus 로고    scopus 로고
    • note
    • CD = 29.4 Hz) ppm, respectively.
  • 60
    • 20544466013 scopus 로고    scopus 로고
    • note
    • In the case of the more acidic alcohols, i.e., trifluoroethanol, our preliminary spectroscopic data clearly indicate a greater degree of proton transfer and the presence of multiple equilibrating complexes that include imidazolium alkoxide derivatives.
  • 66
    • 20544454726 scopus 로고    scopus 로고
    • note
    • Anhydrous lithium chloride was not used in this experiment.
  • 68
    • 0001715627 scopus 로고
    • For use of NHCs in asymmetric catalysis, see refs 7d and 8e in addition to: (a) Sheehan, J. C.; Hunneman, D. H. J. Am. Chem. Soc. 1966, 88, 3666-3667.
    • (1966) J. Am. Chem. Soc. , vol.88 , pp. 3666-3667
    • Sheehan, J.C.1    Hunneman, D.H.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.