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Volumn 126, Issue 34, 2004, Pages 10538-10539

Claisen-type addition of glycine to pyridoxal in water

Author keywords

[No Author keywords available]

Indexed keywords

ACETONE; ALANINE; CARBON DIOXIDE; DEUTERIUM; DEUTERIUM OXIDE; GLYCINE; PYRIDOXAL 5 PHOSPHATE; WATER;

EID: 4344606655     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja047501v     Document Type: Article
Times cited : (16)

References (25)
  • 3
    • 1242318569 scopus 로고    scopus 로고
    • (b) There are several published studies on the exchange of α-amino protons catalyzed by PLP-dependent enzymes, including: Malthouse, J. P. G. Biochim. Biophys. Acta 2003, 1647, 138-142.
    • (2003) Biochim. Biophys. Acta , vol.1647 , pp. 138-142
    • Malthouse, J.P.G.1
  • 4
    • 4344675718 scopus 로고    scopus 로고
    • note
    • - (1 mM).
  • 5
    • 4344659292 scopus 로고    scopus 로고
    • note
    • 13C with a 0.54 s acquisition time, a 90° pulse angle, and a 7.8 s relaxation delay. The chemical shifts for the enriched carbons of the iminium ion adduct of glycine with 1 and the major and minor diastereomers of 2 are 55.6, 59.7, and 59.2 ppm, respectively.
  • 6
    • 4344647169 scopus 로고    scopus 로고
    • note
    • 2O at pD 7.0.5
  • 7
    • 4344644823 scopus 로고    scopus 로고
    • note
    • 1H NMR analysis3a showed that, under these conditions, 1 exists as a mixture consisting of 23.4% of the free aldehyde, 11.6% of the hydrated aldehyde, and 65.0% of the glycine iminium ion adduct.
  • 8
    • 4344717933 scopus 로고    scopus 로고
    • note
    • 4) C, H, N. We have not determined the relative stereochemistry of the major and minor diastereomeric products so that either 2a or 2b could be the major product of the reaction of glycine with 1.
  • 9
    • 4344650016 scopus 로고    scopus 로고
    • note
    • The products of these reactions were not detectable during the first four reaction halftimes and were barely detectable at longer reaction times.
  • 13
    • 4344644822 scopus 로고    scopus 로고
    • note
    • 2O at pH 6.5.
  • 14
    • 4344702246 scopus 로고    scopus 로고
    • note
    • o = 0.10 mM was followed directly by monitoring the decrease in absorbance at 412 nm (Figure 1).
  • 15
    • 4344708245 scopus 로고    scopus 로고
    • note
    • We have not attempted to fit these data to an integrated rate equation for the mechanism shown in Scheme 2 under conditions where there are, formally, two molecules of 1 in the transition state for rate-determining addition of 3 to 1. However, the observation that the effective halftime for this reaction increases with increasing reaction time (Figure 1) provides good qualitative evidence for a reaction that is second-order in [1].


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.