Synthesis of a symmetric multivalent molecule containing four carbohydrate substituents
摘要:
Starting with allyl- and pent-4-enyl-beta-D-glucopyranosides 4-7, different D-Glucose units (8-15) containing alkyl spacers of variable lenght and with different end groups can be prepared. Reaction of four equivalents of the caesium salt derived from propan-4-carboxy-1-yl-2,3,4,6-tetra-O-acetyl-beta-D-glucopyranoside 15 with pentaerythrityltetrabromide yields the tetravalent molecule 16.
Synthesis of a symmetric multivalent molecule containing four carbohydrate substituents
摘要:
Starting with allyl- and pent-4-enyl-beta-D-glucopyranosides 4-7, different D-Glucose units (8-15) containing alkyl spacers of variable lenght and with different end groups can be prepared. Reaction of four equivalents of the caesium salt derived from propan-4-carboxy-1-yl-2,3,4,6-tetra-O-acetyl-beta-D-glucopyranoside 15 with pentaerythrityltetrabromide yields the tetravalent molecule 16.
growing application of tetrazine bioorthogonal chemistry, it is still challenging to access tetrazines conveniently from easily available materials. Described here is the de novo formation of tetrazine from nitriles and hydrazine hydrate using a broad array of thiol‐containing catalysts, including peptides. Using this facile methodology, the syntheses of 14 unsymmetric tetrazines, containing a range of
Pent-4-enyl beta-D-glucopyranoside and its peracetylated and perbenzylated derivatives are shown to be excellent substrates for preparation of a wide variety of spacer functionalities. The spacer derivatives so obtained are promising substrates for preparing agents such as neo-glycoconjugates, micelles, and liquid crystalline phases, which are of interest for studying various biological and physiological phenomena of carbohydrates.
Ferrier, Robert J.; Hall, David W., Journal of the Chemical Society. Perkin transactions I, 1992, # 22, p. 3029 - 3034