Methods of making asymmetric DE ring intermediates for the synthesis of camptothecin and camptothecin analogs employ a dioxane intermediate as the immediate precursor to the DE ring intermediate. Novel intermediates are also disclosed.
制备
喜树碱及其类似物的不对称DE环中间体的方法采用
二氧六环中间体作为DE环中间体的直接前体。还公开了新的中间体。