Propargyl 1,2-Orthoesters for a Catalytic and Stereoselective Synthesis of Pyrimidine Nucleosides
摘要:
Pyrimidine nucleosides are synthesized by using propargyl 1,2-orthoesters and Au(III) salt as a catalyst. Strategically positioned 1,2-orthoesters are found to yield only 1,2-trans nucleosides and enable preparation of 2'-OH containing pyrimidine nucleosides. The glycosyl donor employed in this study is stable and easily accessible. The identified high-yielding protocol is mild, diastereoselective, and catalytic.
Silver-assisted goldcatalysis was applied to alkynyl glycosyl carbonate donors for the synthesis of purine, pyrimidine, quinolin-2-one, and asparagine glycosides. It was demonstrated (40 examples) to be highly versatile for the synthesis of important types of N-glycosides. The method has been utilized for the synthesis of various 2’-modified nucleosides and the disaccharide dipeptide moiety of chloroviruses