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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 683-686 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: One-Step Stereoselective Syntheses of Cyclopentanol Derivatives from 1,5-Anhydro-2,3-O-benzylidene-β-D-ribofuranose1,5-Anhydro-2,3-O-benzylidene-β-D-ribofuranose (1) reacts with butyllithium to give 3,4-benzylidene-1,6-dideoxy-6-C-propyl-α-D-ribo-hexulofuranose (6a). 1L-2,3-O-Benzylidene-1-C-butyl-1,2,3/4-cyclopentanetetrol (5) is formed as a by-product. The analogous reaction with butyllithium yields the corresponding 1,6-dideoxy-hexulose 6b. Reactions of 1,5-anhydro-2,3-O-benzylidene-β-D-lyxofuranose (7) with n-butyl- or methyllithium lead to 8a, b, the enantiomers of 6a, b. Reaction of 1 with lithium diisopropylamide gives 2L-2,3-O-benzylidene-2,3/4-trihydroxycyclopentanone (3 + H⊕). From 1,6-anhydro-3,4-O-isopropylidene-β-D-altropyranose (9) is obtained 2L-2,3-O-isopropylidene-2,3,5/4-tetrahydroxycyclohexanone (10).
    Notes: 1,5-Anhydro-2,3-O-benzyliden-β-D-ribofuranose (1) reagiert mit n-Butyllithium zu 3,4-O-Benzyliden-1,6-didesoxy-6-〈C-Propyl-α-L-ribo-hexulofuranose (6a). Als Nebenprodukt entsteht 1L-2,3-O-Benzyliden-1-C-butyl-1,2,3/4-cyclopentantetrol (5). Die analoge Reaktion mit Methyllithium ergibt die entsprechende 1,6-Didesoxyhexulose 6b. Umsetzungen von 1,5-Anhydro-2,3-O-benzyliden-β-D-lyxofuranose (7) mit Butyl- oder Methyllithium führen zu 8a, b, den Enantiomeren von 6a, b. Reaktion von 1 mit Lithiumdiisopropylamid ergibt 2L-2,3/4-trihydroxycyclopentanon (3 + H⊕). Aus 1,6-Anhydro-3,4-O-Isopropyliden-β-D-altropyranose (9) wird analog 2L-2,3-O-Isopropyliden-2,3,5/4-tetrahydroxycyclohexanon (10) erhalten.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1662-1671 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: One-Step Stereoselective Syntheses of C-Branched α-Deoxycyclitols from 1,6-Anhydrohexopyranoses1,6-Anhydro-3,4-O-isopropylidene-β-D-galactopyranose (1) reacts with n-butyllithium to give exclusively 1D-1-C-butyl-2,3-O-isopropylidene-1,2,3,5/4-cyclohexanepentol (2a). 1,6-Anhydro-2,3-O-isopropylidene-β-D-mannopyranose (7) gives 1L-1-C-butyl-2,3-O-isopropylidene-1,2,3/4,5-cyclohexanepentol (8a) and 1L-1-C-butyl-3,4-O-isopropylidene-1,2,5/3,4-cyclohexanpentol(9a) as a by-product. Analogous reactions with methyllithium yield the corresponding C-methyl-branched deoxyinositols 2b, 4, 8b, and 9b.
    Notes: 1,6-Anhydro-3,4-O-isopropyliden-β-D-galactopyranose (1) reagiert mit n-Butyllithium ausschließlich zu 1D-1-C-Butyl-2,3-O-isopropyliden-1,2,3,5/4-cyclohexanpentol (2a). 1,6-Anhydro-2,3-O-isopropyliden-β-D-mannopyranose (7) ergibt mit n-Butyllithium 1L-5-C-Butyl-2,3-O-isopropyliden-1,2,3/4,5-cyclohexanpentol (8a) und als Nebenprodukt 1L-1-C-Butyl-3,4-O-isopropyliden-1,2,5/3,4-cyclohexanepentol (9a). Analoge Reaktionen mit Methyllithium führen zu den entsprechenden C-Methyl-verzweigten Desoxyinositolen 2b, 4, 8b und 9b.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 967-979 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Further Syntheses of C-Branched α-Deoxycyclitols Starting from 1,6-Anhydrohexopyranoses1,6-Anhydro-3,4-O-isopropylidene-β-D-altropyranose (4) reacts with n-butyllithium to give 1 L-1-C-butyl-2,3-O-isopropylidene-1,2,3,5/4-cyclohexanepentol (5a). The analogous reaction with methyllithium yields the C-methyl-branched cyclitols 5b, 6, and 7. Reaction of 2,7-anhydro-4,5-O-isopropylidene-β-D-sedoheptulopyranose (8) with n-butyllithium gives the di-C-branched cyclitol 9a, whereas with methyllithium the two isomers 9b and 10 are isolated. 1,6-Anhydro-2,3,4-tri-O-methyl-β-D-glucopyranose (11) produces a considerable amount of 2,4-dimethoxyphenol (13) besides the expected C-branched cyclitol 12. The enantiomer of 5a, in terms of the 4-O-methyl derivative 15a, is formed by the reaction of 1,6-anhydro-2-O-methyl-3,4-O-isopropylidene-β-D-galactopyranose (14) with n-butyllithium. Starting from 15a, some additional reactions for C-branched unsaturated cyclitols as well as for aminodeoxycyclitols are described.
    Notes: 1,6-Anhydro-3,4-O-isopropyliden-β-D-altropyranose (4) reagiert mit n-Butyllithium zu 1 L-1-C-Butyl-2,3-O-isopropyliden-1,2,3,5/4-cyclohexanpentol (5a). Die analoge Reaktion mit Methyllithium führt zu den C-Methyl-verzweigten Cyclitolen 5b, 6 und 7. 2,7-Anhydro-4,5-O-isopropyliden-β-D-sedoheptulopyranose (8) ergibt mit n-Butyllithium das di-C-verzweigte Cyclitol 9a, mit Methyllithium die beiden Isomeren 9b und 10. 1,6-Anhydro-2,3,4-tri-O-methyl-β-D-glucopyranose (11) liefert außer dem erwarteten C-verzweigten Cyclitol 12 in nicht unerheblicher Menge 2,4-Dimethoxyphenol (13). 1,6-Anhydro-2-O-methyl-3,4-O-isopropyliden-β-D-galactopyranose (14) bildet mit n-Butyllithium das Enantiomer von 5a in Form des 4-O-Methyl-Derivates 15a. An 15a werden einige Folgereaktionen zu C-verzweigten, ungesättigten Cyclitolen sowie zu Aminodesoxycyclitolen beschrieben.
    Type of Medium: Electronic Resource
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