(2S,3S,4S,5R)-2-((R)-1-Hydroxy-hex-5-enyl)-5-isopropenyl-tetrahydro-pyran-3,4-diol | 1053626-57-5

• 分子结构分类: 有机化合物 - 有机杂环化合物
• 英文名称: (2S,3S,4S,5R)-2-((R)-1-Hydroxy-hex-5-enyl)-5-isopropenyl-tetrahydro-pyran-3,4-diol
• 英文别名: (2S,3S,4S,5R)-2-[(1R)-1-hydroxyhex-5-enyl]-5-prop-1-en-2-yloxane-3,4-diol
• CAS: 1053626-57-5
• 化学式: C₁₄H₂₄O₄
• 分子量: 256.342
• InChiKey: KEBIBPZKJWWNJM-NDKCEZKHSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2
• 重原子数：
  18
• 可旋转键数：
  6
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.71
• 拓扑面积：
  69.9
• 氢给体数：
  3
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  乙酸酐 、 (2S,3S,4S,5R)-2-((R)-1-Hydroxy-hex-5-enyl)-5-isopropenyl-tetrahydro-pyran-3,4-diol 在 4-二甲氨基吡啶 作用下， 以 乙酸乙酯 为溶剂， 反应 0.5h， 生成 Acetic acid (2S,3S,4S,5R)-4-acetoxy-2-((R)-1-acetoxy-hex-5-enyl)-5-isopropenyl-tetrahydro-pyran-3-yl ester
  参考文献：
  名称：

  1,2-O-Isopropylidenefuranose Templates for the Synthesis of Complex Cyclic Ethers via Neighboring Group Participation by the Acetal Ring Oxygen

  摘要：

  Novel strategies are described for the direct transformation of C5-allylated-1,2-O-isopropylidene-furanoses into complex cyclic ethers. Reaction of these substrates with iodonium ion under aqueous conditions resulted in the facile formation of 2,5-disubstituted tetrahydrofurans (THF's) containing highly substituted branches, in good to high yields, albeit with modest cis stereoselectivity. A similar result was obtained for the one case of the analogous tetrahydropyran (THP) system that was examined. These reactions presumably proceed via neighboring group participation by the acetal ring oxygen on an iodonium ion-alkene charge transfer complex to give a cyclic oxonium ion, thence a cyclic ether-oxocarbenium ion which undergoes intermolecular capture by water. Under anhydrous conditions, substrates which contained a 3-0-(2'-methyl-2'-buten-4'-yl) substituent led to high yields of adjacently connected THF-THP or THP-THP structures. These products are explainable in terms of a two-step process in which a cyclic ether-oxocarbenium ion, resulting from the initial participation reaction, undergoes nucleophilic capture by the activated alkene. A notable feature of this reaction was that only a single THP isomer was obtained in the second ring forming reaction, presumably a consequence of the cyclic nature of the oxocarbenium ion derived from the 1,2-O-isopropylidene acetal residue.

  DOI：

  10.1021/jo00105a012
• 作为产物：
  描述：

  (3aS,4S,7R,7aS)-4-((R)-6-Iodomethyl-tetrahydro-pyran-2-yl)-7-isopropenyl-2,2-dimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran 在 盐酸 、 锌 作用下， 以 甲醇 、 乙醇 为溶剂， 反应 3.0h， 生成 (2S,3S,4S,5R)-2-((R)-1-Hydroxy-hex-5-enyl)-5-isopropenyl-tetrahydro-pyran-3,4-diol
  参考文献：
  名称：

  1,2-O-Isopropylidenefuranose Templates for the Synthesis of Complex Cyclic Ethers via Neighboring Group Participation by the Acetal Ring Oxygen

  摘要：

  Novel strategies are described for the direct transformation of C5-allylated-1,2-O-isopropylidene-furanoses into complex cyclic ethers. Reaction of these substrates with iodonium ion under aqueous conditions resulted in the facile formation of 2,5-disubstituted tetrahydrofurans (THF's) containing highly substituted branches, in good to high yields, albeit with modest cis stereoselectivity. A similar result was obtained for the one case of the analogous tetrahydropyran (THP) system that was examined. These reactions presumably proceed via neighboring group participation by the acetal ring oxygen on an iodonium ion-alkene charge transfer complex to give a cyclic oxonium ion, thence a cyclic ether-oxocarbenium ion which undergoes intermolecular capture by water. Under anhydrous conditions, substrates which contained a 3-0-(2'-methyl-2'-buten-4'-yl) substituent led to high yields of adjacently connected THF-THP or THP-THP structures. These products are explainable in terms of a two-step process in which a cyclic ether-oxocarbenium ion, resulting from the initial participation reaction, undergoes nucleophilic capture by the activated alkene. A notable feature of this reaction was that only a single THP isomer was obtained in the second ring forming reaction, presumably a consequence of the cyclic nature of the oxocarbenium ion derived from the 1,2-O-isopropylidene acetal residue.

  DOI：

  10.1021/jo00105a012