2,2-dimethyl-5-(4-methylbenzyl)-1,3-dioxane-4,6-dione | 130296-61-6

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 2,2-dimethyl-5-(4-methylbenzyl)-1,3-dioxane-4,6-dione
• 英文别名: 2,2-Dimethyl-5-[(4-methylphenyl)methyl]-1,3-dioxane-4,6-dione
• CAS: 130296-61-6
• 化学式: C₁₄H₁₆O₄
• 分子量: 248.279
• InChiKey: VMVHUVNIOJVXNQ-UHFFFAOYSA-N

物化性质

• 熔点：
  98 °C
• 沸点：
  455.1±38.0 °C(Predicted)
• 密度：
  1.157±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3
• 重原子数：
  18
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  52.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  2,2-dimethyl-5-(4-methylbenzyl)-1,3-dioxane-4,6-dione 在 碘苯二乙酸 、 苄基三乙基氯化铵 、 potassium carbonate 作用下， 以 氯仿 为溶剂， 反应 11.0h， 以42%的产率得到5-[2,2-Dimethyl-5-[(4-methylphenyl)methyl]-4,6-dioxo-1,3-dioxan-5-yl]-2,2-dimethyl-5-[(4-methylphenyl)methyl]-1,3-dioxane-4,6-dione
  参考文献：
  名称：

  Hypervalent iodine in synthesis. 4. Oxidative coupling of isopropylidene 5-alkylmalonates using (diacetoxyiodo)benzene

  摘要：

  DOI：

  10.1021/jo00001a091
• 作为产物：
  描述：

  丙二酸环(亚)异丙酯 在 sodium tetrahydroborate 、 potassium phosphate 作用下， 以 乙醇 为溶剂， 生成 2,2-dimethyl-5-(4-methylbenzyl)-1,3-dioxane-4,6-dione
  参考文献：
  名称：

  One Pot Synthesis of Monoalkylated and Mixed, Dialkylated Meldrum's Acid Derivatives

  摘要：

  A simple one pot method, involving sequential Knoevenagel condensation of Meldrum's acid with aromatic aldehydes, conjugate reduction of ylidene Meldrum's acid using sodium borohydride followed by alkylation, to prepare mixed dialkylated derivatives of Meldrum's acid is described.

  DOI：

  10.1081/scc-120027234

文献信息

• Quaternary β^2,2-amino acid derivatives by asymmetric addition of isoxazolidin-5-ones to <i>para</i>-quinone methides
  作者：Andreas Eitzinger、Michael Winter、Johannes Schörgenhumer、Mario Waser

  DOI：10.1039/c9cc09239k

  日期：——

  synthesis of a new class of densely functionalized β2,2-amino acid derivatives by reacting isoxazolidin-5-ones with para-quinone methides in the presence of chiral ammonium salt phase-transfer catalysts was developed. The reaction proceeds with exceptionally low catalyst loadings down to 20 ppm on gram scale and the utilization of the primary addition products towards further manipulations was demonstrated

  通过在手性铵盐相转移催化剂的存在下，使异恶唑烷-5-酮与对醌甲基化物反应，开发了新型的高密度功能化β2,2-氨基酸衍生物的高对映选择性（> 99.5％ee）。反应进行时，催化剂的负载量非常低，以克为单位降至20 ppm，对于选定的实例，证明了将主加成产物用于进一步处理的情况。
• High-yielding sequential one-pot synthesis of chiral and achiral α-substituted acrylates via a metal-free reductive coupling reaction
  作者：Dhevalapally B. Ramachary、Chintalapudi Venkaiah、Y. Vijayendar Reddy

  DOI：10.1039/c4ob00667d

  日期：——

  A general process for the high-yielding synthesis of substituted chiral and achiral α-substituted acrylates was achieved through the sequential one-pot combination of a metal-free reductive coupling reaction followed by an Eschenmoser methylenation. The proline catalyzed reaction of Meldrum's acid, aldehydes and Hantzsch ester followed by methylenation was successful with Eschenmoser's salt in the

  通过无金属还原偶联反应的顺序一锅法结合然后进行Eschenmoser甲基化，可以实现高产率合成取代的手性和非手性α-取代的丙烯酸酯的一般方法。在醇溶剂存在下，Eschenmoser盐能成功地使脯氨酸催化Meldrum的酸，醛和Hantzsch酯的甲基化反应。本文中，我们显示了由手性/非手性α-取代丙烯酸酯高特权合成的合成原料，并显示它们是药物和天然产物合成中非常好的中间体。
• Double decarboxylative route to 3-substituted pyrrolidines: Reaction of monoalkyl malonates and related carboxylic acids with sarcosine and formaldehyde
  作者：Evgeny M. Buev、Anastasia A. Smorodina、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh

  DOI：10.1016/j.tetlet.2020.151727

  日期：2020.4

  Three-component reactions of monoalkyl malonates, cyanoacetic acids or 2-ketocarboxylic acids, N-methylglycine, and formaldehyde were developed to rapidly access 3-substituted pyrrolidines in 17–97% yield. These reactions represent a double decarboxylative domino-sequence promoted by pyrrolidine and involve N-methylazomethine ylide as the reactive intermediate. 2020 Elsevier Ltd. All rights reserved

  开发了丙二酸单烷基酯，氰基乙酸或2-酮羧酸，N-甲基甘氨酸和甲醛的三组分反应，以17-97％的产率快速获得3-取代的吡咯烷。这些反应代表由吡咯烷促进的双脱羧多米诺序列，并且涉及N-甲基偶氮甲亚胺叶立德作为反应性中间体。2020 Elsevier Ltd.保留所有权利。
• Environmentally benign decarboxylative <i>N</i>-, <i>O</i>-, and <i>S</i>-acetylations and acylations
  作者：Santanu Ghosh、Anisha Purkait、Chandan K. Jana

  DOI：10.1039/d0gc03731a

  日期：——

  An operationally simple and general method for acetylation and acylation of a wide variety of substrates (amines, alcohols, phenols, thiols, and hydrazones) has been reported. Meldrum's acid and its derivatives have been used as an air-stable, non-volatile, cost-effective, and easy to handle acetylating/acylating agent. Easily separable byproducts (CO2 and acetone) allowed the isolation of analytically

  已经报道了用于多种底物（胺，醇，酚，硫醇和）的乙酰化和酰化的操作简单且通用的方法。Meldrum的酸及其衍生物已被用作空气稳定，不挥发，具有成本效益且易于处理的乙酰化/酰化剂。易于分离的副产物（CO 2和丙酮）可分离分析纯的乙酰化产物，而无需进行后处理和任何色谱分离。
• Traceless Electrophilic Amination for the Synthesis of Unprotected Cyclic β-Amino Acids
  作者：Jin-Sheng Yu、Miguel Espinosa、Hidetoshi Noda、Masakatsu Shibasaki

  DOI：10.1021/jacs.9b05476

  日期：2019.7.3

  describe Rh-catalyzed electrophilic amination of substituted isoxazolidin-5-ones for the synthesis of unprotected, cyclic β-amino acids featuring either benzo-fused or spirocyclic scaffolds. Using the cyclic hydroxylamines allows for retaining both nitrogen and oxygen functionalities in the product. The traceless, redox neutral process proceeds on a gram scale with as little as 0.1 mol% catalyst loading. In

  亲电胺化涉及氮原子的 umpolung，提供了另一种独特的合成策略。最近出现的各种设计的 O 取代羟胺显着推进了这一研究领域。一个被低估的问题是转化的原子经济性：氧原子上必要的活化基团留在了共同产生的废物中。在此，我们描述了取代的异恶唑烷-5-酮的 Rh 催化亲电胺化，用于合成未受保护的环状 β-氨基酸，其特征是苯并稠合或螺环支架。使用环状羟胺可以保留产品中的氮和氧官能团。无痕氧化还原中性过程以克规模进行，催化剂负载量低至 0.1 mol%。与文献中的相关亲电胺化相比，一系列机械实验表明了一种独特的途径，包括螺环化，然后是骨架重排。本文提供的见解阐明了活性物质（由活化的羟胺生成的 Rh-nitrenoid）的细微反应，并扩展了亲电芳香取代的知识。