3,4,6-tri-O-acetyl-1,2-O-[(S)-ethylidene]-α-D-glucopyranose | 38081-37-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二氧吡喃
• 英文名称: 3,4,6-tri-O-acetyl-1,2-O-[(S)-ethylidene]-α-D-glucopyranose
• 英文别名: 3,4,6-tri-O-acetyl-1,2-O-<(S)-ethylidene>-α-D-glucopyranose；7(S)-3,4,6-tri-O-acetyl-1,2-O-ethylidene-α-D-glucopyranose；3,4,6-tri-O-acetyl-1,2-O-(R)-ethylidene-α-D-glucopyranose
• CAS: 38081-37-7
• 化学式: C₁₄H₂₀O₉
• 分子量: 332.307
• InChiKey: NBWFYJVPTWVPKZ-OKDXSUHISA-N

物化性质

• 沸点：
  400.4±45.0 °C(Predicted)
• 密度：
  1.30±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  -0.1
• 重原子数：
  23.0
• 可旋转键数：
  4.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.79
• 拓扑面积：
  106.59
• 氢给体数：
  0.0
• 氢受体数：
  9.0

反应信息

• 作为产物：
  描述：

  2,3,4,6-四乙酰氧基-alpha-D-吡喃葡萄糖溴化物 在 sodium tetrahydroborate 、 四丁基碘化铵 作用下， 以 吡啶 、 乙腈 为溶剂， 反应 35.0h， 生成 3,4,6-tri-O-acetyl-1,2-O-[(S)-ethylidene]-α-D-glucopyranose
  参考文献：
  名称：

  A convenient synthesis of 1,2-O-benzylidene and 1,2-O-ethylidene derivatives of carbohydrates

  摘要：

  DOI：

  10.1016/s0008-6215(00)80547-9

文献信息

• NaBH₃CN: A Janus Substitute for Tin-Free Radical-Based Reactions
  作者：Julie Guiard、Yaniss Rahali、Jean-Pierre Praly

  DOI：10.1002/ejoc.201402441

  日期：2014.7

  depending on the conditions, either by reductive cyclization or atom-transfer radical cyclization. A related cyclization occurred upon using Cu(OAc)2. This and other assays showed the reduction by NaBH3CN of CuII salts, either added or formed in situ. Having both ionic and radical reactivity, NaBH3CN appears as a Janus reagent that may be useful for tin-free radical chemistry under mild and very simple

  除了表明如果溴/碘糖用 NaBH3CN 和 2,2"-偶氮二异丁腈处理时热自由基反应（还原、Giese 反应）是有效的，我们还探索了基于 CuI 盐（≤0.5 当量）的新引发条件。通过一组从有机溴化物产生自由基。这已得到证实，因为在惰性气氛下，乙酰溴葡萄糖在约 50 °C 被还原为重排的 2-脱氧葡萄糖，并且随着 N-烯丙基 α-溴酰胺反应，取决于条件，通过还原环化或原子转移自由基环化。使用 Cu(OAc)2 时会发生相关的环化反应。该试验和其他试验表明，添加或原位形成的 CuII 盐被 NaBH3CN 还原。具有离子和自由基两种反应性，
• NaBH3CN and other systems as substitutes of tin and silicon hydrides in the light or heat-initiated reduction of halosugars: a tunable access to either 2-deoxy sugars or 1,5-anhydro-itols
  作者：Isabelle Bruyère、Zoltan Tóth、Hamida Benyahia、Jia Lu Xue、Jean-Pierre Praly

  DOI：10.1016/j.tet.2013.09.032

  日期：2013.11

  UV light-promoted reduction of acetobromoglucose by NaBH3CN in t-BuOH afforded 1,3,4,6-tetra-O-acetyl-2-deoxy-alpha-D-arabino-hexopyranose in high yield and purity, via a Surzur-Tanner rearrangement, while, with 10 mol % thiophenol added, acetylated 1,5-anhydro-D-glucitol was cleanly obtained. Such tin-free and mild reductions, presumed to proceed via radical pathways, were more efficient with NaBH3CN compared to NaBH4 or NaBD4, and do not occur with acetochloroglucose. Similar reductions to 1,3,4,6-tetra-O-acetyl-2-deoxy-alpha-D-arabino-hexopyranose were achieved upon heating to 80 degrees C t-BuOH or CH3CN solutions of NaBH3CN and AIBN, but with a lower selectivity due to competing ionic reactions. With other pyranosyl bromides, reductions by NaBH3CN could be tuned similarly (D-galacto), but some (D-manno, 5-thio-D-xylo) gave mainly or exclusively 1,5-anhydro-itols. Other conditions, or reagents promoting SET process, afforded also reduced products, but with lower rates or selectivities. Primary iodides were reduced readily with NaBH3CN under UV light. (c) 2013 Elsevier Ltd. All rights reserved.