2,2-Dimethyl-5-oxo-3-(tetrahydro-pyran-2-yloxymethyl)-heptanoic acid ethyl ester | 157635-52-4

• 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: 2,2-Dimethyl-5-oxo-3-(tetrahydro-pyran-2-yloxymethyl)-heptanoic acid ethyl ester
• 英文别名: Ethyl 2,2-dimethyl-3-(oxan-2-yloxymethyl)-5-oxoheptanoate；ethyl 2,2-dimethyl-3-(oxan-2-yloxymethyl)-5-oxoheptanoate
• CAS: 157635-52-4
• 化学式: C₁₇H₃₀O₅
• 分子量: 314.422
• InChiKey: BBCCSWMWYFGKHH-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.4
• 重原子数：
  22
• 可旋转键数：
  10
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  61.8
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  2,2-Dimethyl-5-oxo-3-(tetrahydro-pyran-2-yloxymethyl)-heptanoic acid ethyl ester 在 potassium tert-butylate 、 三乙胺 作用下， 以 乙醚 、 二氯甲烷 为溶剂， 反应 3.0h， 生成 Acetic acid 2,4,4-trimethyl-3-oxo-5-(tetrahydro-pyran-2-yloxymethyl)-cyclohex-1-enyl ester
  参考文献：
  名称：

  An Efficient Approach toward Taxane Analogs: Atrop- and Diastereoselective Eight-Membered B Ring Cyclizations for Synthesis of Aromatic C-Ring Taxinine Derivatives

  摘要：

  We have developed efficient methods for construction of the C-2 oxygenated aromatic C-ring taxane skeleton based on an eight-membered ring cyclization involving a Lewis acid-mediated intramolecular coupling reaction of the dienol silyl ether at C-10 and the acetal at C-9. The C-2 stereogenic center strongly influences the conformation of the forming eight-membered ring during the cyclization reaction. 1 beta,2 alpha-Siloxy derivative 13b gives exo isomer 15 as the major product, and 1 beta,2 beta-siloxy derivative 13a exclusively yields endo isomer 14. Both of these cyclization products, which had undesired stereochemistry, were converted to stereochemically refined aromatic C-ring taxinine analogs by multistep transformations. The chelation-controlled, eight-membered ring cyclization of 1 beta,2 alpha-hydroxy derivative 31 was found to give exclusively the desired 1 beta,2 alpha,9 alpha,10 beta-endo isomer 16 in good yield. This remarkably stereoselective cyclization, when combined with stereocontrolled AC ring coupling reactions, should provide an efficient, convergent route toward various taxane derivatives. The aromatic C-ring taxinine analogs could be converted to natural taxinine by further transformation of the aromatic C-ring.

  DOI：

  10.1021/jo00090a039
• 作为产物：
  描述：

  哌喃 在 Lindlar's catalyst 正丁基锂 、 草酰氯 、 氢气 、 二甲基亚砜 作用下， 以 四氢呋喃 、 正己烷 、 二氯甲烷 为溶剂， 反应 21.0h， 生成 2,2-Dimethyl-5-oxo-3-(tetrahydro-pyran-2-yloxymethyl)-heptanoic acid ethyl ester
  参考文献：
  名称：

  (-)-紫杉醇的对映选择性全合成

  摘要：

  完成了紫杉醇的对映选择性全合成。光学纯 A 环羟基醛与芳族 C 环片段的偶联反应，然后是路易斯酸介导的八元 B 环环化，得到所需的 ABC 内三碳环。该产物的 C 环部分在 Birch 条件下被还原为环己二烯衍生物，该衍生物被来自凸 β 面的单线态氧氧化，立体选择性地得到 C4β、C7β-二醇。为了引入C19-甲基，环丙基酮通过C-环烯丙醇的环丙烷化或氰基与C-环烯酮的共轭加成来制备。环丙烷环的还原裂解，然后将所得烯醇异构化为相应的酮，得到含有 C19-甲基的关键合成中间体。

  DOI：

  10.1021/ja9939439

文献信息

• Enantioselective Total Synthesis of (−)-Taxol
  作者：Hiroyuki Kusama、Ryoma Hara、Shigeru Kawahara、Toshiyuki Nishimori、Hajime Kashima、Nobuhito Nakamura、Koichiro Morihira、Isao Kuwajima

  DOI：10.1021/ja9939439

  日期：2000.4.1

  Enantioselective total synthesis of taxol has been accomplished. Coupling reaction of the optically pure A-ring hydroxy aldehyde with the aromatic C-ring fragment followed by Lewis acid mediated eight-membered B-ring cyclization gave the desired ABC endo-tricarbocycle. The C-ring moiety of this product was reduced under Birch conditions to the cyclohexadiene derivative, which was oxygenated by singlet

  完成了紫杉醇的对映选择性全合成。光学纯 A 环羟基醛与芳族 C 环片段的偶联反应，然后是路易斯酸介导的八元 B 环环化，得到所需的 ABC 内三碳环。该产物的 C 环部分在 Birch 条件下被还原为环己二烯衍生物，该衍生物被来自凸 β 面的单线态氧氧化，立体选择性地得到 C4β、C7β-二醇。为了引入C19-甲基，环丙基酮通过C-环烯丙醇的环丙烷化或氰基与C-环烯酮的共轭加成来制备。环丙烷环的还原裂解，然后将所得烯醇异构化为相应的酮，得到含有 C19-甲基的关键合成中间体。
• An Efficient Approach toward Taxane Analogs: Atrop- and Diastereoselective Eight-Membered B Ring Cyclizations for Synthesis of Aromatic C-Ring Taxinine Derivatives
  作者：Masaki Seto、Koichiro Morihira、Yoshiaki Horiguchi、Isao Kuwajima

  DOI：10.1021/jo00090a039

  日期：1994.6

  We have developed efficient methods for construction of the C-2 oxygenated aromatic C-ring taxane skeleton based on an eight-membered ring cyclization involving a Lewis acid-mediated intramolecular coupling reaction of the dienol silyl ether at C-10 and the acetal at C-9. The C-2 stereogenic center strongly influences the conformation of the forming eight-membered ring during the cyclization reaction. 1 beta,2 alpha-Siloxy derivative 13b gives exo isomer 15 as the major product, and 1 beta,2 beta-siloxy derivative 13a exclusively yields endo isomer 14. Both of these cyclization products, which had undesired stereochemistry, were converted to stereochemically refined aromatic C-ring taxinine analogs by multistep transformations. The chelation-controlled, eight-membered ring cyclization of 1 beta,2 alpha-hydroxy derivative 31 was found to give exclusively the desired 1 beta,2 alpha,9 alpha,10 beta-endo isomer 16 in good yield. This remarkably stereoselective cyclization, when combined with stereocontrolled AC ring coupling reactions, should provide an efficient, convergent route toward various taxane derivatives. The aromatic C-ring taxinine analogs could be converted to natural taxinine by further transformation of the aromatic C-ring.