4-di-O-benzyl-5,6-O-cyclic sulfates 5, 16 and 25, derived from D-arabinose, D-ribose and D-xylose, respectively, are useful precursors in the synthesis of 2,5-anhydrohexitols. 5-Exo-tet cyclization of compounds 5, 16, and 25 under the influence of base leads to the predominant or exclusive formation of the corresponding tetrahydrofuran derivatives
2- ø -乙酰基3,4-二- ø -苄基-5,6- ø -环状
硫酸酯5,16和25,从d-
阿拉伯糖,d
核糖和d
木糖衍生的,分别是有用的前体在2,5-脱
水己糖醇的合成中。5-外型- TET化合物环化5,16,和25基极引线的至主要或相应的
四氢呋喃衍
生物的独家形成的影响下