2,3:4,6-Di-<i>O</i>-isopropylidene-α-<scp>L</scp>-sorbofuranose and 2,3-<i>O</i>-isopropylidene-α-<scp>L</scp>-sorbofuranose
作者:Vratislav Langer、Bohumil Steiner、Miroslav Koóš
DOI:10.1107/s0108270109008294
日期:2009.4.15
7730 (12) Å]. This study illustrates both the similarity between the conformations of furanose, 1,3‐dioxolane and 1,3‐dioxane rings in analogous isopropylidene‐substituted carbohydrate structures and the only negligible influence of the presence of a 1,3‐dioxane ring on the conformations of furanose and 1,3‐dioxolane rings. In addition, in comparison with reported analogs, replacement of the –CH2OH group at
在标题化合物C 12 H 20 O 6(I)和C 9 H 16 O 6(II)中,五元呋喃糖环采用4 T 3构象,五元1,3-二氧戊环环采用E 3构象。(I)中的六元1,3-二恶烷环采用几乎理想的O C 3构象。这些化合物的氢键模式基本不同:(I)仅具有一个分子内O-H ... O氢键[O ... O = 2.933(3)Å],而(II)除了相应的分子内O-H ... O氢键[O ... O = 2.7638(13)Å],两个这种类型的分子间键[O ... O = 2.7708(13)和2.7730(12)Å]。这项研究说明了在类似的异亚丙基取代的碳水化合物结构中,呋喃糖,1,3-二氧戊环和1,3-二氧六环的构象之间的相似性,以及存在的1,3-二氧六环对构象的影响可忽略不计呋喃糖和1,3-二氧戊环环。此外,与报道的类似物相比,–CH 2的取代另一个基团在C1-呋喃糖位置的OH基团可能会严重影响1