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Volumn 4, Issue 11, 2002, Pages 1883-1886

Lobocyclamide B from Lyngbya confervoides. Configuration and Asymmetric Synthesis of β-Hydroxy-α-amino Acids by (-)-Sparteine-Mediated Aldol Addition

Author keywords

[No Author keywords available]

Indexed keywords

AMINO ACID; ANTIFUNGAL AGENT; DYES, REAGENTS, INDICATORS, MARKERS AND BUFFERS; LITHIUM; SPARTEINE;

EID: 0037198776     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol025876k     Document Type: Article
Times cited : (66)

References (42)
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    • Optical purities of all purified threo and erythro diastereomers were determined by chiral HPLC (Chiral Pak OD column, 1-2.5% i-PrOH: hexanes, UV and evaporative light scattering detectors)
    • Optical purities of all purified threo and erythro diastereomers were determined by chiral HPLC (Chiral Pak OD column, 1-2.5% i-PrOH: hexanes, UV and evaporative light scattering detectors).
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    • 2, MeOH) gave the γ-hydroxythreonine diastereomers (2S,3S)-(-)-2-amino-3,4-dihydroxybutyric acid and (2R,3S)-(+)-2-amino-3,4-dihydroxybutyric acid, respectively. For a synthesis of the enantiomer of the latter compound, see: Pirrung, M. C.; Nunn, D. S.; McPhail, A. T.; Mitchell, R. E. Bioorg. Med. Chem. Lett. 1993, 3, 2095-2098. For the definitive configurational assignments of β-hydroxythreonine stereoisomers, see: Hamel, E. E.; Painter, E. P. J. Am. Chem. Soc. 1953, 75, 1362-1368. Niemann, C.; Nichols, P. L. J Biol. Chem. 1942, 143, 191-199.
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    • 2, MeOH) gave the γ-hydroxythreonine diastereomers (2S,3S)-(-)-2-amino-3,4-dihydroxybutyric acid and (2R,3S)-(+)-2-amino-3,4-dihydroxybutyric acid, respectively. For a synthesis of the enantiomer of the latter compound, see: Pirrung, M. C.; Nunn, D. S.; McPhail, A. T.; Mitchell, R. E. Bioorg. Med. Chem. Lett. 1993, 3, 2095-2098. For the definitive configurational assignments of β-hydroxythreonine stereoisomers, see: Hamel, E. E.; Painter, E. P. J. Am. Chem. Soc. 1953, 75, 1362-1368. Niemann, C.; Nichols, P. L. J Biol. Chem. 1942, 143, 191-199.
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    • 4-promoted aldol reactions of chiral N-acyloxazolidinethiones has been reported (Crimmins, M. T.; King, B. W.; Tabet, E. A.; Chaudhary, K. J. Org. Chem. 2001, 66, 894-902). In view of the fact that similar, very high diastereoselectivities were obtained under these highly coordinating conditions, even when achiral tert-amines were substituted for (-)-sparteine, the role of the chiral diamine in enantiodifferentiation is somewhat masked.
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    • 4-promoted aldol reactions of chiral N-acyloxazolidinethiones has been reported (Crimmins, M. T.; King, B. W.; Tabet, E. A.; Chaudhary, K. J. Org. Chem. 2001, 66, 894-902). In view of the fact that similar, very high diastereoselectivities were obtained under these highly coordinating conditions, even when achiral tert-amines were substituted for (-)-sparteine, the role of the chiral diamine in enantiodifferentiation is somewhat masked.
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    • For enantioselective additions of aggregates of organolithiums/chiral aminoalkoxides to aldehydes and ketones, see: Briggs, T. F.; Winemiller, M. D.; Xiang, B.; Collum, D. B. J. Org. Chem. 2001, 66(19), 6291-6298 and references cited within.
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    • note
    • Since the aldol reaction mixtures were observed to be heterogeneous and contained sparingly soluble white precipitates, we cannot discount the possibility that reactions occur at the surface of heterogeneous chiral aggregates which influence the stereochemical outcome.
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    • Normal phase HPLC(10 × 250 mm, 0.5% i-PrOH:hexane, 2.0 mL/ min)
    • Normal phase HPLC(10 × 250 mm, 0.5% i-PrOH:hexane, 2.0 mL/ min).
  • 38
    • 51849181148 scopus 로고
    • 3CN:50 mM triethylammonium phosphate, aq, 1.0 mL/min). To obtain the retention times of ent-2a,2b and ent-3a,3b the amino acids 2a,2b and 3a,3b were reacted with the "ent-" Marfey's reagent [(2,4-dinitro-5-fluorophenylamino)-D-alaninamide], prepared from D-alaninamide according to Marfey. L-Valine and D-glutamine (as D-glutamate) were determined separately using chiral HPLC (D-penicillamine-based column).
    • (1984) Carlsberg Res. Commun. , vol.49 , pp. 591-596
    • Marfey, P.1
  • 42
    • 0442265305 scopus 로고    scopus 로고
    • note
    • The remainder of the amino acid residues in 1 were determined by Marfey's procedure as L-Ala, N-Me-L-Ile, allo-L-Thr (×2), and trans-L-Hpro using commercially available standards.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.