Length Matters: One Additional Methylene Group in a Reactant is Able to Affect the Reactivity Pattern and Significantly Increase the Product Yield / E. V. Stepanova [et al.]
Уровень набора: SynlettЯзык: английский.Страна: .Резюме или реферат: The outcome of the nucleophilic opening of 3-O-benzoyl-β-d-arabinofuranose 1,2,5-orthobenzoate with 4-(ω-chloroalkoxy)phenols (SnCl4, CH2Cl2, -25 °C) unusually strongly depends on the length of the methylene chain of the nucleophile. The presence of one extra methylene group in the molecule of 4-(3-chloropropoxy)phenol [as compared to 4-(2-chloroetoxy)phenol] results in four-fold reduction in the reaction time and five-fold increase in the yield of a selectively protected monosaccharide glycoside with a hydroxy group at C-5, which is a valuable building block for the synthesis of oligoarabinofuranosides related to mycobacterial arabinans. Possible reasons and consequences of this finding are discussed..Примечания о наличии в документе библиографии/указателя: [References: 12 tit.].Аудитория: .Тематика: электронный ресурс | труды учёных ТПУ | mycobacterial arabinans | oligosaccharides | glycosylation | orthoesters | phenols | reactivity pattern | substituent effects | solution structure | олигосахариды | гликозилирование | ортоэфиры | фенолы Ресурсы он-лайн:Щелкните здесь для доступа в онлайнTitle screen
[References: 12 tit.]
The outcome of the nucleophilic opening of 3-O-benzoyl-β-d-arabinofuranose 1,2,5-orthobenzoate with 4-(ω-chloroalkoxy)phenols (SnCl4, CH2Cl2, -25 °C) unusually strongly depends on the length of the methylene chain of the nucleophile. The presence of one extra methylene group in the molecule of 4-(3-chloropropoxy)phenol [as compared to 4-(2-chloroetoxy)phenol] results in four-fold reduction in the reaction time and five-fold increase in the yield of a selectively protected monosaccharide glycoside with a hydroxy group at C-5, which is a valuable building block for the synthesis of oligoarabinofuranosides related to mycobacterial arabinans. Possible reasons and consequences of this finding are discussed.
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