Stereocontrolled Synthesis of 2-Deoxy-galactopyranosides via Isopropylidene-Protected 6- O-Silylated Donors. 2018

Dan-Mei Yang, and Yue Chen, and Ryan P Sweeney, and Todd L Lowary, and Xing-Yong Liang
School of Chemistry Engineering , Sichuan University of Science & Engineering , Zigong 643000 , China.

The stereocontrolled synthesis of 2-deoxy-d- arabino-hexopyranosides ("galactopyranosides") using 3,4- O-isopropylidene-6- O- tert-butyldiphenylsilyl-protected glycosyl donors is reported. 2-Deoxy-thioglycoside 3e gives excellent α-selectivity, while galactal 9 leads to, in a two-step protocol, 2-deoxy-β-glycosides in high stereoselectivity. The selectivity of both reagents is believed to arise from the combination of the isopropylidene acetal spanning O-3 and O-4 together with the sterically demanding silyl group on O-6. The utility of the method was demonstrated through the synthesis of a trisaccharide that contains both 2-deoxy α- and β-d-galactopyranosyl residues.

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