3-(2-Methyl-[1,3]dioxan-2-yl)-propionic acid | 188406-89-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 3-(2-Methyl-[1,3]dioxan-2-yl)-propionic acid
• 英文别名: 3-(2-Methyl-1,3-dioxan-2-yl)propanoic acid
• CAS: 188406-89-5
• 化学式: C₈H₁₄O₄
• 分子量: 174.197
• InChiKey: JXYGMHRQEDDULN-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.3
• 重原子数：
  12
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  55.8
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  3-(2-Methyl-[1,3]dioxan-2-yl)-propionic acid 在 dirhodium tetraacetate 、 溶剂黄146 、 三乙胺 、 氯甲酸甲酯 作用下， 以 二氯甲烷 为溶剂， 反应 0.5h， 生成 1-methyl-2,6-dioxabicyclo[5.3.0]decan-8-one
  参考文献：
  名称：

  Three- and Four-Carbon Elongating Ring Expansion of Cyclic Acetals to Medium-Sized Dioxacycloalkenones. Use of the Intramolecular Formation of Oxonium Ylides

  摘要：

  The Rh(II)-catalyzed reaction of 2-(3'-diazo-2'-oxopropyl)-2-methyldioxolane (1) in the presence of a protic nucleophile (NuH) such as AcOH resulted in effective ring enlargement to give the 8-membered 3-acetoxydioxocanone 4a (41%) and dioxocan-2-en-1-one 3 (46%). Similar treatment of 2-(4'-diazo-3'-oxobutyl)-2-methyldioxolane (9) with AcOH gave 4-acetoxydioxonanone 10 (67%), which was readily hydrolyzed on silica gel to a tautomeric mixture of hydrolysis products 16a and 16b (total yield 46%). In contrast, similar treatment of 2-(5'-diazo-4'-oxopentyl)-2-methyldioxolane (19) gave 2,5-dioxa-1-methyldecalin-7-one (20, 24%), and the yield increased to 61% in the absence of AcOH, by Stevens rearrangement. The reaction of 1,3-dioxane homologues 26 and 31 gave similar results. All of these reactions can be explained in terms of the intermediacy of bicyclooxonium ylides, which undergo either a Stevens rearrangement or, after protonation by a NuH, ring enlargement through release of the strain of the bicyclic ylides. Evidence of the reversible formation of oxonium ylides is also provided.

  DOI：

  10.1021/jo961844x
• 作为产物：
  描述：

  乙酰丙酸乙酯 在 盐酸 、 sodium hydroxide 、 对甲苯磺酸 作用下， 生成 3-(2-Methyl-[1,3]dioxan-2-yl)-propionic acid
  参考文献：
  名称：

  Three- and Four-Carbon Elongating Ring Expansion of Cyclic Acetals to Medium-Sized Dioxacycloalkenones. Use of the Intramolecular Formation of Oxonium Ylides

  摘要：

  The Rh(II)-catalyzed reaction of 2-(3'-diazo-2'-oxopropyl)-2-methyldioxolane (1) in the presence of a protic nucleophile (NuH) such as AcOH resulted in effective ring enlargement to give the 8-membered 3-acetoxydioxocanone 4a (41%) and dioxocan-2-en-1-one 3 (46%). Similar treatment of 2-(4'-diazo-3'-oxobutyl)-2-methyldioxolane (9) with AcOH gave 4-acetoxydioxonanone 10 (67%), which was readily hydrolyzed on silica gel to a tautomeric mixture of hydrolysis products 16a and 16b (total yield 46%). In contrast, similar treatment of 2-(5'-diazo-4'-oxopentyl)-2-methyldioxolane (19) gave 2,5-dioxa-1-methyldecalin-7-one (20, 24%), and the yield increased to 61% in the absence of AcOH, by Stevens rearrangement. The reaction of 1,3-dioxane homologues 26 and 31 gave similar results. All of these reactions can be explained in terms of the intermediacy of bicyclooxonium ylides, which undergo either a Stevens rearrangement or, after protonation by a NuH, ring enlargement through release of the strain of the bicyclic ylides. Evidence of the reversible formation of oxonium ylides is also provided.

  DOI：

  10.1021/jo961844x

文献信息

• Acid Catalyzed Competitive Esterification and Ketalization of Levulinic Acid with 1,2 and 1,3-Diols: The Effect of Heterogeneous and Homogeneous Catalysts
  作者：Ananda S. Amarasekara、Moriam A. Animashaun

  DOI：10.1007/s10562-016-1812-8

  日期：2016.9

  reactions of levulinic acid (LA) with 1,2-ethanediol (1,2-ED), 1,2-propanediol (1,2-PD), and 1,3-propanediol (1,3-PD) were studied using Amberlyst-15 as well as p-toluenesulfonic acid catalysts in benzene under Dean–Stark conditions. In Amberlyst-15 catalyzed reactions the products are ketals and ketal-esters, whereas p-toluenesulfonic acid catalyzed reactions produce esters and ketal-esters as products

  研究了乙酰丙酸 (LA) 与 1,2-乙二醇 (1,2-ED)、1,2-丙二醇 (1,2-PD) 和 1,3-丙二醇 (1,3-PD) 的缩合反应在 Dean-Stark 条件下，在苯中使用 Amberlyst-15 和对甲苯磺酸催化剂。在 Amberlyst-15 催化反应中，产物是缩酮和缩酮酯，而对甲苯磺酸催化反应生成酯和缩酮酯作为产物。在对甲苯磺酸催化的 1,2-ED 和 1,3-PD 反应中，LA 单酯产物在 180 分钟后作为主要产物形成，产率分别为 75% 和 97%。与之前报道的乙酰丙酸乙酯与二醇的酸催化缩酮化不同，LA 与二醇的缩酮化-酯化反应是一个复杂的过程。