Total Synthesis of Everninomicin 13,384-1-Part 4: Explorations of Methodology; Stereocontrolled Synthesis of 1,1′-Disaccharides, 1,2-Seleno Migrations in Carbohydrates, and Solution- and Solid-Phase Synthesis of 2-Deoxy Glycosides and Orthoesters
作者:K. C. Nicolaou、Konstantina C. Fylaktakidou、Helen J. Mitchell、Floris L. van Delft、Rosa Maria Rodríguez、Scott R. Conley、Zhendong Jin
DOI:10.1002/1521-3765(20000901)6:17<3166::aid-chem3166>3.0.co;2-z
日期:——
2-deoxy glycosides, and orthoesters are reported. Specifically, a tin-acetal moiety was utilized to fix the anomeric stereochemistry of a carbohydrate acceptor leading to an efficient and stereoselective synthesis of 1,1'-disaccharides, while a newly discovered 1,2-phenylseleno migration reaction in carbohydrates opened entries to 2-deoxy glycosides and orthoesters. Thus, reaction of 2-hydroxy phenylselenoglycosides
报道了立体控制1,1'-二糖,2-脱氧糖苷和原酸酯的构建方法。具体而言,锡-乙缩醛部分用于固定碳水化合物受体的异头立体化学,导致1,1'-二糖的高效和立体选择性合成,而碳水化合物中新发现的1,2-苯基硒代迁移反应使2的条目打开-脱氧糖苷和原酸酯。因此,2-羟基苯基硒代糖苷与DAST的反应产生了2-苯基硒代糖基氟化物,其与碳水化合物受体反应以选择性地立体生成2-苯基硒代糖苷。后面的化合物可以通过相应的乙烯酮缩醛还原性地选择为2-脱氧糖苷或氧化转化为原酸酯。