N-benzoylglycine/thiourea cooperative catalyzed stereoselective O-glycosidation: Activation of O-glycosyl trichloroacetimidate donors
作者:Atul Dubey、Rekha Sangwan、Pintu Kumar Mandal
DOI:10.1016/j.catcom.2019.04.006
日期:2019.5
A new practical utility for beta-stereoselective glycosylation via activation of O-glycosyl trichloroacetimidate donors using N-benzoylglycine/thiourea cooperative catalysis has been demonstrated. This method represents the first instance where amino acid derived N-benzoylglycine is used as a catalyst for O-glycosylation under mild reaction conditions at ambient temperature. NMR spectroscopy studies suggest that thiourea cocatalyst exhibit a cooperative behaviour that has a strong effect on the reaction rate, yield, and the beta-selectivity.
2-Bromoethyl glycosides: synthesis and characterisation