4,5-dimethoxy-2-nitrostilbene

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 二苯乙烯类
• 英文名称: 4,5-dimethoxy-2-nitrostilbene
• 英文别名: 1,2-dimethoxy-4-nitro-5-styrylbenzene；1,2-dimethoxy-4-nitro-5-[(E)-2-phenylethenyl]benzene
• 化学式: C₁₆H₁₅NO₄
• 分子量: 285.299
• InChiKey: MLKUDKWYTQBMFT-CMDGGOBGSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4
• 重原子数：
  21
• 可旋转键数：
  4
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.12
• 拓扑面积：
  64.3
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  苯乙烯 、 6-硝基藜芦酸 在 palladium(II) trifluoroacetate silver carbonate 作用下， 以 二甲基亚砜 、 N,N-二甲基甲酰胺 为溶剂， 反应 3.0h， 以85%的产率得到4,5-dimethoxy-2-nitrostilbene
  参考文献：
  名称：

  Development of a Decarboxylative Palladation Reaction and Its Use in a Heck-type Olefination of Arene Carboxylates

  摘要：

  The development of a palladium-catalyzed decarboxylative coupling reaction of arene carboxylates with olefinic substrates is described. The optimized procedure for decarboxylative palladation employs Pd(O2CCF3)2 as catalyst (0.2 equiv) in the presence of Ag2CO3 (3 equiv) in the solvent 5% DMSO-DMF and proceeds at temperatures of 80-120 degrees C with a wide range of arene carboxylates and alkenes as substrates. The process is proposed to proceed by an initial Ar-SE reaction involving ipso attack of an electrophilic Pd(II) intermediate on an arene carboxylate to form an arylpalladium(II) species with loss of carbon dioxide. This intermediate is then proposed to react with an olefinic substrate by steps common to the Heck coupling process. Reoxidation of the liberated Pd(0) in situ is proposed to establish the catalytic cycle.

  DOI：

  10.1021/ja027523m

文献信息

• Synthesis of Indoles by Reductive Cyclization of Nitro Compounds Using Formate Esters as CO Surrogates
  作者：Manar Ahmed Fouad、Francesco Ferretti、Dario Formenti、Fabio Milani、Fabio Ragaini

  DOI：10.1002/ejoc.202100789

  日期：2021.9.14

  A very efficient, general and scalable protocol for the preparation of indoles and other N-heterocycles from suitably substituted nitroarenes using alkyl and phenyl formates as CO surrogates was described. Using phenyl formate, the products were isolated in yields often higher than those previously achieved by using gaseous CO. The mechanism of both the decarbonylation reaction of phenyl formate and

  描述了使用烷基和苯基甲酸酯作为 CO 替代物从适当取代的硝基芳烃制备吲哚和其他N-杂环的非常有效、通用和可扩展的方案。使用甲酸苯酯，产物的分离产率通常高于以前使用气态 CO 实现的产率。通过动力学和机理研究阐明了甲酸苯酯的脱羰反应和环化反应的机理。
• Development of a Decarboxylative Palladation Reaction and Its Use in a Heck-type Olefination of Arene Carboxylates
  作者：Andrew G. Myers、Daisuke Tanaka、Michael R. Mannion

  DOI：10.1021/ja027523m

  日期：2002.9.1

  The development of a palladium-catalyzed decarboxylative coupling reaction of arene carboxylates with olefinic substrates is described. The optimized procedure for decarboxylative palladation employs Pd(O2CCF3)2 as catalyst (0.2 equiv) in the presence of Ag2CO3 (3 equiv) in the solvent 5% DMSO-DMF and proceeds at temperatures of 80-120 degrees C with a wide range of arene carboxylates and alkenes as substrates. The process is proposed to proceed by an initial Ar-SE reaction involving ipso attack of an electrophilic Pd(II) intermediate on an arene carboxylate to form an arylpalladium(II) species with loss of carbon dioxide. This intermediate is then proposed to react with an olefinic substrate by steps common to the Heck coupling process. Reoxidation of the liberated Pd(0) in situ is proposed to establish the catalytic cycle.