The paper researched the synthesis of p-methylcalix[6]arene and ptertbutylcalix[8]arene catalyzed by KOH in moderate yields under microwave irradiation. The effects of different factors on this condensation reaction have been discussed. Compared with classical method, this method had some merits such as easy obtaining the raw materials, short reaction route, simple and convenient aftertreatment, being beneficial to environmental protection.
Stereoselective 1,3-dipolar cycloadditions of exo-glycals 1 to nitrones 2, 5 and 8 were investigated under the catalysis of Lewis acid or in a refluxing benzene or toluene solution, and afforded the corresponding cycloadducts of ketosyl spiro-isoxazolidines. The reductive cleavage of the N-O bond in the isoxazolidine ring and debenzylation by the catalytic hydrogenation [Pd(OH) 2 /C] were approached using the glucose-type cycloadducts 6b and 6e to alkyl-C-glycoside derivatives 12, providing a new access to a novel alkyl-C-glycoside containing an amino group on the side alkyl chain.
A practical and efficient synthesis of five-membered azasugar derivatives
E Higher Education Press and Springer-Verlag 2008Abstract A practical and efficient synthesis of 1,4-dideoxy-1,4-imino-D-arabinol and its partially protected derivatives has been described via the key intermediate with a norbornane-like structure using D-glucose as a starting material.
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