2-benzyl-2,3-dihydrobenzo[b][1,4]dioxine

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并二恶烷
• 英文名称: 2-benzyl-2,3-dihydrobenzo[b][1,4]dioxine
• 英文别名: 2-benzyl-2,3-dihydro-1,4-benzodioxine；3-Benzyl-2,3-dihydro-1,4-benzodioxine
• 化学式: C₁₅H₁₄O₂
• 分子量: 226.275
• InChiKey: QORFYNAJWGNFAW-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.7
• 重原子数：
  17
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.2
• 拓扑面积：
  18.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  (Z)-2-benzylidene-2,3-dihydrobenzo[b][1,4]dioxine 在 palladium on activated charcoal 氢气 作用下， 以 乙醇 为溶剂， 反应 16.0h， 以88%的产率得到2-benzyl-2,3-dihydrobenzo[b][1,4]dioxine
  参考文献：
  名称：

  Palladium-Catalyzed Heteroannulation Leading to Heterocyclic Structures with Two Heteroatoms:  A Highly Convenient and Facile Method for a Totally Regio- and Stereoselective Synthesis of (Z)-2,3-Dihydro-2-(ylidene)-1,4-benzo- and -naphtho[2,3-b]dioxins

  摘要：

  A facile method for the synthesis of (Z)-2,3-dihydro-2-(ylidene)-1,4-benzo- and naphthodioxins (3) has been developed using palladium-copper catalysis. Aryl halides 2 were found to react with mono-prop-2-ynylated catechol (1a) or 2-hydroxy-3-(prop-2-ynyloxy)naphthalene (1b) in the presence of (PPh3)(2)PdCl2 (3.5 mol%) and CuI (7 mol%) in triethylamine by stirring at room temperature for 20 h followed by heating at 100 degrees C for 16 h to give products 3 in good yields. The method is regio- and stereoselective and also amenable to bisheteroannulation. The Z-stereochemistry of products 3 was established firmly from H-1 NMR, (3)J(CH) values (between vinylic proton and methylenic carbon of the heterocyclic ring), proton NOE measurements, and finally from X-ray analysis. Based on experimental observations and known palladium chemistry, a mechanism has been proposed to explain the regio- and stereoselective product formation. Some of he products 3 were also converted to 1,4-benzodioxan derivatives 6 using hydrogenation procedure. A uracil derivative of possible biological interest, possessing a 1,4-benzodioxinyl functionality at the C-5 position, has been synthesized.

  DOI：

  10.1021/jo9717595

文献信息

• Functional Group Tolerant Kumada−Corriu−Tamao Coupling of Nonactivated Alkyl Halides with Aryl and Heteroaryl Nucleophiles: Catalysis by a Nickel Pincer Complex Permits the Coupling of Functionalized Grignard Reagents
  作者：Oleg Vechorkin、Valérie Proust、Xile Hu

  DOI：10.1021/ja9027378

  日期：2009.7.22

  A nickel(II) pincer complex [((Me)NN(2))NiCl] (1) catalyzes Kumada-Corriu-Tamao cross coupling of nonactivated alkyl halides with aryl and heteroaryl Grignard reagents. The coupling of octyl bromide with phenylmagnesium chloride was used as a test reaction. Using 3 mol % of 1 as the precatalyst and THF as the solvent, and in the presence of a catalytic amount of TMEDA, the coupling product was obtained

  镍 (II) 钳形复合物 [((Me)NN(2))NiCl] (1) 催化未活化的卤代烷与芳基和杂芳基格氏试剂的 Kumada-Corriu-Tamao 交叉偶联。辛基溴与苯基氯化镁的偶联用作测试反应。以3mol%的1为预催化剂，THF为溶剂，在催化量的TMEDA存在下，以高收率得到偶联产物。该反应条件可用于其他伯和仲烷基溴化物和碘化物的交叉偶联。该偶联可耐受范围广泛的官能团。因此，将含有酯、酰胺、醚、硫醚、醇、吡咯、吲哚、呋喃、腈、共轭烯酮和芳基卤部分的卤代烷进行偶联，以得到高分离产率的产品，其中这些单元保持完整。对于含酯底物的偶联，O-TMEDA 是比 TMEDA 更好的添加剂。该反应方案被证明对于 Knochel 型官能化格氏试剂的偶联是有效的。因此，含有缺电子和/或敏感酯、腈、酰胺和 CF(3) 取代基的芳基格氏试剂可以成功地偶联到未活化和功能化的烷基碘。该催化还可以有效地将烷基碘
• Copper(I)-Catalyzed Intramolecular Caryl-O Bond-Forming Cyclization for the Synthesis of 1,4-Benzodioxines and Its Application in the Total Synthesis of Sweetening Isovanillins
  作者：Govindasamy Sekar、Ajay Naidu、D. Ganapathy

  DOI：10.1055/s-0030-1258206

  日期：2010.10

  Various substituted 1,4-benzodioxines were synthesized through an Ullmann-type intramolecular Caryl-O coupling cyclization reaction using a catalytic amount of BINOL-CuI complex. This methodology was successfully utilized as the key step in the total synthesis of isovanillyl sweetening agents 5-(2,3-dihydro-1,4-benzodioxin-2-yl)-2-methoxyphenol and 5-(2,3-dihydro-1,4-benz­oxathiin-2-yl)-2-methoxyphenol in 15.8% and 14.85% overall yields in five steps from isovanillin.

  在一定量的 BINOL-CuI 复合物催化下，通过乌尔曼型分子内 Caryl-O 偶联环化反应合成了各种取代的 1,4-苯并二恶烷。作为异香兰素甜味剂 5-(2,3-二氢-1,4-苯并二恶烷-2-基)-2-甲氧基苯酚和 5-(2,3-二氢-1,4-苯并恶烷-2-基)-2-甲氧基苯酚总合成的关键步骤，成功地利用了这一方法。
• Palladium-Catalyzed Heteroannulation Leading to Heterocyclic Structures with Two Heteroatoms:  A Highly Convenient and Facile Method for a Totally Regio- and Stereoselective Synthesis of (<i>Z</i>)-2,3-Dihydro-2-(ylidene)-1,4-benzo- and -naphtho[2,3-<i>b</i>]dioxins
  作者：Chinmay Chowdhury、Gopeswar Chaudhuri、Subhadra Guha、Alok k. Mukherjee、Nitya G. Kundu

  DOI：10.1021/jo9717595

  日期：1998.3.1

  A facile method for the synthesis of (Z)-2,3-dihydro-2-(ylidene)-1,4-benzo- and naphthodioxins (3) has been developed using palladium-copper catalysis. Aryl halides 2 were found to react with mono-prop-2-ynylated catechol (1a) or 2-hydroxy-3-(prop-2-ynyloxy)naphthalene (1b) in the presence of (PPh3)(2)PdCl2 (3.5 mol%) and CuI (7 mol%) in triethylamine by stirring at room temperature for 20 h followed by heating at 100 degrees C for 16 h to give products 3 in good yields. The method is regio- and stereoselective and also amenable to bisheteroannulation. The Z-stereochemistry of products 3 was established firmly from H-1 NMR, (3)J(CH) values (between vinylic proton and methylenic carbon of the heterocyclic ring), proton NOE measurements, and finally from X-ray analysis. Based on experimental observations and known palladium chemistry, a mechanism has been proposed to explain the regio- and stereoselective product formation. Some of he products 3 were also converted to 1,4-benzodioxan derivatives 6 using hydrogenation procedure. A uracil derivative of possible biological interest, possessing a 1,4-benzodioxinyl functionality at the C-5 position, has been synthesized.