Esterification of 1,4:3,6-dianhydro-D-glucitol (1) with carboxcylic acids in the presence of 4-dimethylaminopyridine and dicyclohexylcar- bodiimide affords 2-exo-acylates 3 with high regioselectivity, in addition to small amounts of the isomeric 5-endo-acylates 4 and 2,5-diacylates 5.
在 4-二甲基
氨基吡啶和二环己基碳二
亚胺的存在下,1,4:3,6-二氢-
D-葡萄糖醇(1)与
羧酸发生酯化反应,除了生成少量异构的 5-内向酰化物 4 和 2,5-二酰化物 5 外,还能以高区域选择性生成 2-外向酰化物 3。