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Preparation of O-peracetylated N-β-d-glucopyranosyl-N′-acyl urea derivatives resulted in the formation of anomeric mixtures under the following conditions: acylation of O-peracetylated β-d-glucopyranosyl urea by acyl chlorides in the presence of ZnCl 2 in refluxing CHCl 3 ; addition of O-peracetylated β-d-glucopyranosylamine to acyl isocyanates in acetonitrile at rt; addition of carboxamides...
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