2-Cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsilyl)phenyl)ethanol | 169563-59-1

• 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: 2-Cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsilyl)phenyl)ethanol
• 英文别名: 2-Cyclopropylidene-2-(4,5-dimethoxy-2-trimethylsilylphenyl)ethanol
• CAS: 169563-59-1
• 化学式: C₁₆H₂₄O₃Si
• 分子量: 292.45
• InChiKey: UVNFBWRUTIDNBY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.79
• 重原子数：
  20
• 可旋转键数：
  5
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  38.7
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  2-Cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsilyl)phenyl)ethanol 在 titanium(IV) isopropylate 、 叔丁基过氧化氢 、 L-(+)-酒石酸二异丙酯 、 4 A molecular sieve 作用下， 生成 (S)-(-)-2-(4,5-Dimethoxy-2-(trimethylsilyl)phenyl)-2-(hydroxymethyl)cyclobutanone 、 (R)-(+)-2-(4,5-Dimethoxy-2-(trimethylsilyl)phenyl)-2-(hydroxymethyl)cyclobutanone
  参考文献：
  名称：

  A Highly Enantiocontrolled Strategy for the Synthesis of Benzylic Quaternary Carbon Centers. A Formal Total Synthesis of (-)-Mesembrine

  摘要：

  A remarkable substituent effect by a trimethylsilyl group was observed on the enantioselectivity of the tandem asymmetric epoxidation and enantiospecific ring expansion of 2-cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsiyl)phenyl)ethanol (24), affording (S)-(-)-2-(4,5-dimethoxy)-2-(trimethylsilyl)phenyl-2-(hydroxymethyl)cyclobutanone (25) in high enantiomeric excess. This feature enabled us to accomplish a concise and highly enantioselective total synthesis of(-)-mesembrine (1), providing a new and general strategy for the enantioselective synthesis of benzylic quaternary carbon centers.

  DOI：

  10.1021/jo00126a030
• 作为产物：
  描述：

  2-(2-bromo-4,5-dimethoxyphenyl)-1,3-dioxolane 在 重铬酸吡啶 、 4 A molecular sieve 、 四丁基氟化铵 、 水 、 sodium methylate 、 sodium hydride 、 碳酸氢钠 、 对甲苯磺酸 、 三乙胺 、 间氯过氧苯甲酸 作用下， 以 四氢呋喃 、 六甲基磷酰三胺 、 正己烷 、 二氯甲烷 、 丙酮 为溶剂， 反应 38.67h， 生成 2-Cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsilyl)phenyl)ethanol
  参考文献：
  名称：

  A Highly Enantiocontrolled Strategy for the Synthesis of Benzylic Quaternary Carbon Centers. A Formal Total Synthesis of (-)-Mesembrine

  摘要：

  A remarkable substituent effect by a trimethylsilyl group was observed on the enantioselectivity of the tandem asymmetric epoxidation and enantiospecific ring expansion of 2-cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsiyl)phenyl)ethanol (24), affording (S)-(-)-2-(4,5-dimethoxy)-2-(trimethylsilyl)phenyl-2-(hydroxymethyl)cyclobutanone (25) in high enantiomeric excess. This feature enabled us to accomplish a concise and highly enantioselective total synthesis of(-)-mesembrine (1), providing a new and general strategy for the enantioselective synthesis of benzylic quaternary carbon centers.

  DOI：

  10.1021/jo00126a030

文献信息

• A Highly Enantiocontrolled Strategy for the Synthesis of Benzylic Quaternary Carbon Centers. A Formal Total Synthesis of (-)-Mesembrine
  作者：Hideo Nemoto、Tetsuro Tanabe、Keiichiro Fukumoto

  DOI：10.1021/jo00126a030

  日期：1995.10

  A remarkable substituent effect by a trimethylsilyl group was observed on the enantioselectivity of the tandem asymmetric epoxidation and enantiospecific ring expansion of 2-cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsiyl)phenyl)ethanol (24), affording (S)-(-)-2-(4,5-dimethoxy)-2-(trimethylsilyl)phenyl-2-(hydroxymethyl)cyclobutanone (25) in high enantiomeric excess. This feature enabled us to accomplish a concise and highly enantioselective total synthesis of(-)-mesembrine (1), providing a new and general strategy for the enantioselective synthesis of benzylic quaternary carbon centers.