by the Corey-Seebach method. Depending on the designed protecting groups, the orthogonally protected six- and seven-membered ring amino carbasugars can be produced selectively and efficiently. (-)-Calystegine B(3) was synthesized from one of those products with high yield. This is the first anionic cyclization pathway to calystegine type structures.
借助于精心选择的保护基,d-
氨基葡萄糖三亚甲基二
硫缩醛衍
生物被成功氧化为相应的6-醛。该方法颠倒了正常开链糖上的供体和受体位置,并改变了N-取代基的相对位置。由6-醛,通过Corey-Chaykovsky反应制备庚糖
环氧化物衍
生物,并通过Corey-Seebach方法环化。取决于设计的保护基团,可以选择性地和有效地生产正交保护的六元和七元环
氨基碳糖。(-)-Calystegine B(3)是从其中一种产品中合成的,具有很高的收率。这是第一个对卡介素型结构的阴离子环化途径。