Diastereoselective Synthesis of Pentasubstituted γ-Butyrolactones from Silyl Glyoxylates and Ketones through a Double Reformatsky Reaction
作者:Stephen N. Greszler、Jeffrey S. Johnson
DOI:10.1002/anie.200900215
日期:2009.5.4
Three contiguous stereocenters can be established with remarkable diastereoselectivity in a double Reformatsky sequence. Densely functionalized γ‐butyrolactones were assembled rapidly by this approach, in which a ketone is used as the terminal electrophile (see scheme). Secondary transformations of the lactone products enhance their synthetic utility. R1=Me, H; R2=alkyl, aryl, CF3; Bn=benzyl, TBS=
可以在双 Reformatsky 序列中以显着的非对映选择性建立三个连续的立体中心。通过这种方法可以快速组装密集官能化的 γ-丁内酯,其中使用酮作为末端亲电试剂(参见方案)。内酯产物的二次转化增强了它们的合成效用。R 1 =我,H;R 2 = 烷基、芳基、CF 3;Bn=苄基,TBS=叔丁基二甲基甲硅烷基。