4,4-bis(methoxycarbonyl)-8-(tert-butyldimethylsiloxy)-6(E)-nonen-1-yne | 156084-25-2

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: 4,4-bis(methoxycarbonyl)-8-(tert-butyldimethylsiloxy)-6(E)-nonen-1-yne
• CAS: 156084-25-2
• 化学式: C₁₉H₃₂O₅Si
• 分子量: 368.546
• InChiKey: TUNIQWWKMYVHCU-VAWYXSNFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.7
• 重原子数：
  25.0
• 可旋转键数：
  8.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.68
• 拓扑面积：
  61.83
• 氢给体数：
  0.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  4,4-bis(methoxycarbonyl)-8-(tert-butyldimethylsiloxy)-6(E)-nonen-1-yne 在 Pd₂(dibenzylideneacetone)2*CHCl₃ 、 溶剂黄146 、 三苯基膦 作用下， 以 四氢呋喃 、 苯 为溶剂， 反应 86.0h， 生成 dimethyl (1R,3aS,4R,8bR)-1-methyl-3-oxo-4-(phenylcarbamoyl)-3a,4,5,6,8,8b-hexahydro-1H-cyclopenta[e][2]benzofuran-7,7-dicarboxylate
  参考文献：
  名称：

  Pd-Catalyzed Cycloisomerization to 1,2-Dialkylidenecycloalkanes. 2. Alternative Catalyst System

  摘要：

  The mechanisms by which palladium complexes may catalyze the cycloisomerization of 1,6- and 1,7-enynes to dialkylidenecycloalkanes were probed by exploring a catalyst system different than a ligated palladium acetate which previously has proven to be successful. Although carboxylic acids showed no discernible interaction with palladium(0) complexes, this combination proved to be a powerful catalyst system to effect this cycloisomerization. The fact that the two catalyst systems do not have the same reactivity profile suggests this new catalyst system may operate by a different mechanism. Evidence supporting a pathway invoking formation of a hydridopalladium acetate followed by hydropalladation as initiation is presented. Steric and electronic effects direct the regioselectivity of the termination step to form either 1,3- or 1,4-diene products. The 1,3-diene products participate exceedingly well in Diels-Alder reactions, both inter- and intramolecularly. The presence of an oxygen substituent at the position allylic to the diene served as both a regiochemical control element for the palladium-catalyzed cycloisomerization and a diastereochemical control element for the Diels-Alder reaction. The net result of these two steps, the first of which is a catalyzed isomerization and the second an addition, is a highly efficient approach to complex polycycles in terms of both selectivity and atom economy.

  DOI：

  10.1021/ja00089a016
• 作为产物：
  描述：

  炔丙基丙二酸二甲酯 在 2,6-二甲基吡啶 、 Pd₂(dibenzylideneacetone)2*CHCl₃ 、 三苯基膦 、 pyridinium chlorochromate 作用下， 以 四氢呋喃 、 乙醚 、 二氯甲烷 为溶剂， 反应 28.0h， 生成 4,4-bis(methoxycarbonyl)-8-(tert-butyldimethylsiloxy)-6(E)-nonen-1-yne
  参考文献：
  名称：

  Pd-Catalyzed Cycloisomerization to 1,2-Dialkylidenecycloalkanes. 2. Alternative Catalyst System

  摘要：

  The mechanisms by which palladium complexes may catalyze the cycloisomerization of 1,6- and 1,7-enynes to dialkylidenecycloalkanes were probed by exploring a catalyst system different than a ligated palladium acetate which previously has proven to be successful. Although carboxylic acids showed no discernible interaction with palladium(0) complexes, this combination proved to be a powerful catalyst system to effect this cycloisomerization. The fact that the two catalyst systems do not have the same reactivity profile suggests this new catalyst system may operate by a different mechanism. Evidence supporting a pathway invoking formation of a hydridopalladium acetate followed by hydropalladation as initiation is presented. Steric and electronic effects direct the regioselectivity of the termination step to form either 1,3- or 1,4-diene products. The 1,3-diene products participate exceedingly well in Diels-Alder reactions, both inter- and intramolecularly. The presence of an oxygen substituent at the position allylic to the diene served as both a regiochemical control element for the palladium-catalyzed cycloisomerization and a diastereochemical control element for the Diels-Alder reaction. The net result of these two steps, the first of which is a catalyzed isomerization and the second an addition, is a highly efficient approach to complex polycycles in terms of both selectivity and atom economy.

  DOI：

  10.1021/ja00089a016

文献信息

• Hydroxy group as a regio- and stereochemical control element for sequential metal-catalyzed and thermal cyclizations
  作者：Barry M. Trost、Donna C. Lee

  DOI：10.1021/jo00271a006

  日期：1989.5