methyl 2-(2-methoxy-2-methyl-3-butyn-4-yl)benzoate | 142458-81-9

• 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: methyl 2-(2-methoxy-2-methyl-3-butyn-4-yl)benzoate
• 英文别名: methyl 2-(3-methoxy-3-methylbut-1-yn-1-yl)benzoate；Methyl 2-(3-methoxy-3-methylbut-1-ynyl)benzoate
• CAS: 142458-81-9
• 化学式: C₁₄H₁₆O₃
• 分子量: 232.279
• InChiKey: YQCRORZGZGDNFU-UHFFFAOYSA-N

物化性质

• 沸点：
  327.9±27.0 °C(Predicted)
• 密度：
  1.08±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3
• 重原子数：
  17
• 可旋转键数：
  5
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  methyl 2-(2-methoxy-2-methyl-3-butyn-4-yl)benzoate 在 Rh2[(+/-)-mandelate]4 、 oxonium 作用下， 反应 0.5h， 生成 3-<2-(3-oxobutylidene)>-1H-indanone
  参考文献：
  名称：

  Rhodium carbenoid mediated cyclizations of o-alkynyl-substituted .alpha.-diazoacetophenones

  摘要：

  o-Alkynyl-substituted alpha-diazoacetophenones undergo facile cyclization to indenone derivatives upon treatment with catalytic quantities of Rh(II) carboxylates. A variety of structural influences were encountered by varying the nature of the substituent group attached to the alkyne carbon atom. The cyclization reaction involves addition of a rhodium stabilized carbenoid onto the acetylenic pi-bond to generate a vinyl carbenoid. The vinyl carbenoid was found to undergo both CH and CC migration as well as delta-CH insertion into the alkyl backbone. Different catalysts were shown to result in significant variation in the product ratios for these reactions. Treatment of o-(5-(allyloxy)-1-pentynyl)-alpha-diazoacetophenone with rhodium(II) mandelate afforded 2-(2-propen-1-yl)-2-(1-oxo-1H-indenyl)-2,3,4,5-tetrahydrofuran in high yield. The formation of this compound involves initial formation of a vinyl carbenoid which reacts with the neighboring oxygen atom to give an oxonium ylide which subsequently undergoes a 2,3-sigmatropic rearrangement. When 2-ethynyl-alpha-diazoacetophenone is used, only products derived from 6-endo closure are observed. Substituted o-alkynyl alpha-diazoacetophenones give products derived from 5-exo cyclization. The mode of ring closure is controlled by both steric and electronic factors.

  DOI：

  10.1021/jo00044a032
• 作为产物：
  描述：

  邻溴苯甲酸甲酯 在 bis-triphenylphosphine-palladium(II) chloride 、 copper(l) iodide 、 sodium hydride 、 三乙胺 作用下， 以 甲苯 为溶剂， 反应 42.33h， 生成 methyl 2-(2-methoxy-2-methyl-3-butyn-4-yl)benzoate
  参考文献：
  名称：

  Rhodium carbenoid mediated cyclizations of o-alkynyl-substituted .alpha.-diazoacetophenones

  摘要：

  o-Alkynyl-substituted alpha-diazoacetophenones undergo facile cyclization to indenone derivatives upon treatment with catalytic quantities of Rh(II) carboxylates. A variety of structural influences were encountered by varying the nature of the substituent group attached to the alkyne carbon atom. The cyclization reaction involves addition of a rhodium stabilized carbenoid onto the acetylenic pi-bond to generate a vinyl carbenoid. The vinyl carbenoid was found to undergo both CH and CC migration as well as delta-CH insertion into the alkyl backbone. Different catalysts were shown to result in significant variation in the product ratios for these reactions. Treatment of o-(5-(allyloxy)-1-pentynyl)-alpha-diazoacetophenone with rhodium(II) mandelate afforded 2-(2-propen-1-yl)-2-(1-oxo-1H-indenyl)-2,3,4,5-tetrahydrofuran in high yield. The formation of this compound involves initial formation of a vinyl carbenoid which reacts with the neighboring oxygen atom to give an oxonium ylide which subsequently undergoes a 2,3-sigmatropic rearrangement. When 2-ethynyl-alpha-diazoacetophenone is used, only products derived from 6-endo closure are observed. Substituted o-alkynyl alpha-diazoacetophenones give products derived from 5-exo cyclization. The mode of ring closure is controlled by both steric and electronic factors.

  DOI：

  10.1021/jo00044a032

文献信息

• Mechanistic Divergence in the Hydrogenative Synthesis of Furans and Butenolides: Ruthenium Carbenes Formed by <i>gem</i> ‐Hydrogenation or through Carbophilic Activation of Alkynes
  作者：Sebastian Peil、Alois Fürstner

  DOI：10.1002/anie.201912161

  日期：2019.12.16

  Enynes with a tethered carbonyl substituent are converted into substituted furan derivatives upon hydrogenation using [Cp*RuCl]4 as the catalyst. Paradoxically, this transformation can occur along two distinct pathways, each of which proceeds via discrete pianostool ruthenium carbenes. In the first case, hydrogenation and carbene formation are synchronized ("gem-hydrogenation"), whereas the second

  使用[Cp * RuCl] 4作为催化剂，在氢化后，具有束缚的羰基取代基的烯炔被转化为取代的呋喃衍生物。矛盾的是，这种转变可能沿着两个不同的途径发生，每个途径都是通过离散的钢琴凳钌碳酸盐进行的。在第一种情况下，氢化和卡宾的形成是同步的（“宝石氢化”），而第二种途径包括通过三键的亲碳活化形成卡宾，然后进行氢化催化剂再循环。两种方法的代表性卡宾中间体均通过X射线晶体学表征；结构数据证明，羰基对亲电子卡宾中心的攻击遵循Bürgi-Dunitz轨迹。
• Rhodium carbenoid mediated cyclizations of o-alkynyl-substituted .alpha.-diazoacetophenones
  作者：Albert Padwa、Keith E. Krumpe、Jamal M. Kassir

  DOI：10.1021/jo00044a032

  日期：1992.8

  o-Alkynyl-substituted alpha-diazoacetophenones undergo facile cyclization to indenone derivatives upon treatment with catalytic quantities of Rh(II) carboxylates. A variety of structural influences were encountered by varying the nature of the substituent group attached to the alkyne carbon atom. The cyclization reaction involves addition of a rhodium stabilized carbenoid onto the acetylenic pi-bond to generate a vinyl carbenoid. The vinyl carbenoid was found to undergo both CH and CC migration as well as delta-CH insertion into the alkyl backbone. Different catalysts were shown to result in significant variation in the product ratios for these reactions. Treatment of o-(5-(allyloxy)-1-pentynyl)-alpha-diazoacetophenone with rhodium(II) mandelate afforded 2-(2-propen-1-yl)-2-(1-oxo-1H-indenyl)-2,3,4,5-tetrahydrofuran in high yield. The formation of this compound involves initial formation of a vinyl carbenoid which reacts with the neighboring oxygen atom to give an oxonium ylide which subsequently undergoes a 2,3-sigmatropic rearrangement. When 2-ethynyl-alpha-diazoacetophenone is used, only products derived from 6-endo closure are observed. Substituted o-alkynyl alpha-diazoacetophenones give products derived from 5-exo cyclization. The mode of ring closure is controlled by both steric and electronic factors.