An efficient approach for the synthesis of Z-1,3-enynes based on the coupling reaction of Z-vinyl tellurides and alkynes containing a pseudoglycoside moiety is described. The products were obtained in good yields via a stereoselective way. Preliminary screening against three tumor cell lines indicated that the synthesized compounds are promising intermediates for the synthesis of an array of more potent target structures.
The ultrasound-promoted glycosidation of several alcohols using 3,4,6-triO -acetyl-D-glucal as the glycosyl donor is described. The products were obtained in a short reaction time at room temperature in good yield and α-selectivity in an open flask, thus avoiding the preparation and manipulation of unstable or sensitive catalysts.
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