1995
DOI: 10.1016/0008-6215(94)00275-k
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Improved synthesis of glycosylamines and a straightforward preparation of N-acylglycosylamines as carbohydrate-based detergents

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Cited by 106 publications
(67 citation statements)
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“…[8] Notwithstanding, attempts to prepare the corresponding tri-O-acetylated glycosyl bromide from 6-azido-6-deoxy-d-glucose (1), [10] available in two steps from d-glucose via the 6-O-tosyl derivative, [11] by peracetylation and treatment with hydrogen bromide in glacial acetic acid were unsuccessful. [12] Transformation of 1 into the corresponding glycosylamine by treatment with ammonium hydroxide/sodium hydrogencarbonate and decomposition of the resulting ammonium glycosylcarbamate salt 2 by successive lyophilisations [13] also failed, affording extensive formation of bis(glycosylamine) as well as hydrolysis back to 1 (1:1, 85 %), as seen by NMR spectroscopy and mass spectrometry. Since compound 2 already possesses a latent amine functionality installed at the anomeric position, we considered the possibility of using the carbamate salt directly for further elaboration without liberating the unstable O-unprotected glycosylamine.…”
Section: Monomer Synthesismentioning
confidence: 95%
“…[8] Notwithstanding, attempts to prepare the corresponding tri-O-acetylated glycosyl bromide from 6-azido-6-deoxy-d-glucose (1), [10] available in two steps from d-glucose via the 6-O-tosyl derivative, [11] by peracetylation and treatment with hydrogen bromide in glacial acetic acid were unsuccessful. [12] Transformation of 1 into the corresponding glycosylamine by treatment with ammonium hydroxide/sodium hydrogencarbonate and decomposition of the resulting ammonium glycosylcarbamate salt 2 by successive lyophilisations [13] also failed, affording extensive formation of bis(glycosylamine) as well as hydrolysis back to 1 (1:1, 85 %), as seen by NMR spectroscopy and mass spectrometry. Since compound 2 already possesses a latent amine functionality installed at the anomeric position, we considered the possibility of using the carbamate salt directly for further elaboration without liberating the unstable O-unprotected glycosylamine.…”
Section: Monomer Synthesismentioning
confidence: 95%
“…The reaction probably proceeds as indicated in Scheme 1. The use of higher-boiling or more polar alcohols (ethylene glycol) or aqueous alcohol solvents in the presence of buffers, according to the Kochetkov method for preparation of primary glycosylamines, [38] did not result in significant improvements in yield of the product.…”
Section: Exploratory Workmentioning
confidence: 99%
“…As glicosilaminas 9 e 10 foram preparadas a partir dos derivados 1-azido-1-desoxi correspondentes (7 e 8), por reação de hidrogenação catalítica do grupo azido. Glicosilaminas são reconhecidamente instáveis, susceptíveis à anomerização e a reações de hidrólise 17,23 . Em vista disto, as glicosilaminas 9 e 10, logo que obtidas, foram prontamente convertidas nas amidas e sufonamidas 13a-e e 14a-d, sem purificação prévia, pela reação com os agentes acilantes e sulfonilantes adequados.…”
Section: Sínteseunclassified