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Volumn 7, Issue 16, 2001, Pages 3446-3460

First total syntheses of aeruginosin 298-A and aeruginosin 298-B, based on a stereocontrolled route to the new amino acid 6-hydroxyoctahydroindole-2-carboxylic acid

Author keywords

Aeruginosins; Amino acids; Peptides; Thrombin inhibitor; Total synthesis

Indexed keywords

AMINO ACIDS; CARBOXYLIC ACIDS; HYDROGENATION; ISOMERS; STEREOCHEMISTRY;

EID: 0035902879     PISSN: 09476539     EISSN: None     Source Type: Journal    
DOI: 10.1002/1521-3765(20010817)7:16<3446::AID-CHEM3446>3.0.CO;2-0     Document Type: Article
Times cited : (80)

References (66)
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    • [2a] that aeruginosin 298-A has an L-Leu unit, in this work we conclude that a D-Leu is present in this natural product.
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    • note
    • Structures were set up with standard bond lengths and angles by using the Chem-X molecular modeling package, version Jan97. All structures were initially optimized by using the steepest descents and conjugate gradient methods. After semiempirical optimization with the MOPAC program (version 6.0), charge distributions were calculated with the aid of the AM1 method. The PULAY keyword and the eigenvector following the (EF) routine for minimum search with GNORM = 0.1 were used in the optimization step. Conformation analysis was performed with full AM1 optimization. All calculations were performed on a Digital Alpha Station 300.
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    • This diagnostic rule fits with the NMR data of all N-substituted derivatives synthesized in this work. N-Tosylated cis-2-carboxyoctahydroindoles follow the same pattern: A. Nuhrich, J. Moulines, Tetrahedron 1991, 47, 3075-3088.
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    • N-unsubstituted cis-2-carboxyoctahydroindoles follow an inverse rule, showing the exo derivatives as triplets and endo compounds as doublets of doublets (≈ 10, 4 Hz) for H-2: a) R. Henning, H. Urbach, Tetrahedron Lett. 1983, 24, 5339-5342;
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    • [11a]
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    • Alkene 24 is formed as a by-product
    • Alkene 24 is formed as a by-product.
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    • In some runs, this compound appears to be partially trifluoroacetylated at the Choi oxygen, but this is not a synthetic problem since the trifluoroacetate is cleaved before the last coupling, in the saponification step
    • In some runs, this compound appears to be partially trifluoroacetylated at the Choi oxygen, but this is not a synthetic problem since the trifluoroacetate is cleaved before the last coupling, in the saponification step.
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    • [2e] by diazotation of 4-amino-D-phenylalanine in 31% yield
    • [2e] by diazotation of 4-amino-D-phenylalanine in 31% yield.
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    • note
    • 25 = +22.3. We are unable to comment on the significance of this discrepancy, except to note that our sample was a hydrochloride salt while the natural product had been isolated as a trifluoroacetate salt.
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    • Mixtures of exo- and endo-9 and their corresponding dimethyl acetals were observed by NMR during this stage
    • Mixtures of exo- and endo-9 and their corresponding dimethyl acetals were observed by NMR during this stage.
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    • 2/EtOAc (9:1), small quantities (<3% yield) of a trans isomer were isolated
    • 2/EtOAc (9:1), small quantities (<3% yield) of a trans isomer were isolated.
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    • For analytical data see Supporting Information
    • For analytical data see Supporting Information.
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    • The optical rotation value corresponds to that of a sample obtained from the recrystallyzed Hpla derivative 34 (ee >98%)
    • The optical rotation value corresponds to that of a sample obtained from the recrystallyzed Hpla derivative 34 (ee >98%).


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