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Volumn 75, Issue 24, 2010, Pages 8542-8549

Calcium-promoted pictet-spengler reactions of ketones and aldehydes

Author keywords

[No Author keywords available]

Indexed keywords

IMINE FORMATION; LEWIS ACID; LEWIS ACID CATALYSTS; PICTET-SPENGLER REACTIONS; TETRAHYDROISOQUINOLINES;

EID: 78650352896     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo1019283     Document Type: Article
Times cited : (37)

References (42)
  • 21
    • 77954068671 scopus 로고    scopus 로고
    • For reviews on the Pictet-Spengler Reaction see
    • For reviews on the Pictet-Spengler Reaction see: Lorenz, M.; Van Linn, M. L.; Cook, J. M. Curr. Org. Synth. 2010, 7, 189
    • (2010) Curr. Org. Synth. , vol.7 , pp. 189
    • Lorenz, M.1    Van Linn, M.L.2    Cook, J.M.3
  • 38
    • 78650408943 scopus 로고    scopus 로고
    • -1) in the downfield portion of the infrared spectrum
    • -1 is observed, which is the characteristic absorbance for ammonium ions and tetrasubstituted amines. By observing this peak, we are presuming that under our reaction conditions the molecules may exist in their zwitterionic form. This form makes for very difficult separation and purification due to the high polarity of the electrostatic interactions within the molecules. In fact, chromatographic separation cannot be achieved without strong eluting conditions as the compounds reside on the baseline. Recrystallization is also an acceptable pathway to obtain the product, but low yields and the compound's ability to retain solvent led us away from this purification method. Therefore, a simple trituration with a low boiling and relatively low polarity solvent such as diethyl ether achieved good yields in most cases, even though this isolation technique is not completely quantitative. Therefore, we observe very high and sometimes even quantitative conversion of starting materials to products, but the chemical properties of these compounds lower the amount of isolated material.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.