Lithium and boron enolates of 2,2-dialkyl-1,3-dioxa-5-ones react with aldehydes to give aldol products in high diastereoselectivity and, when chiral lithium enolates are generated using optically pure chiral lithium amide bases, in high enantioselectivity. Dioxanone lithium enolates react readily with protected glyceraldehyde affording protected ketohexoses in high diastereo- and enantiomeric purity.
锂和
硼的2,2-二烷基-1,3-二氧-5-酮的烯醇盐与醛反应,生成高立体选择性的醇缩合产物;当使用光学纯的手性
锂氨基酸碱生成手性
锂烯醇盐时,反应展现出高的对映选择性。二氢
呋喃酮
锂烯醇盐与保护的
甘油醛反应,得到高立体和对映体纯度的保护酮六糖。