3-aza-3-methyl-4-phenylbicyclo[4.4.0]decan-2-one

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 哌啶类
• 英文名称: 3-aza-3-methyl-4-phenylbicyclo[4.4.0]decan-2-one
• 英文别名: (3R,4aR,8aR)-2-methyl-3-phenyl-3,4,4a,5,6,7,8,8a-octahydroisoquinolin-1-one
• 化学式: C₁₆H₂₁NO
• 分子量: 243.349
• InChiKey: RBUUYXWBHXENHV-RBSFLKMASA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  18
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.56
• 拓扑面积：
  20.3
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为产物：
  描述：

  7-辛烯酸,甲基酯 在 氢氧化钾 、 草酰氯 、 偶氮二异丁腈 、 四溴化碳 、 三正丁基氢锡 、 N,N-二甲基甲酰胺 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 甲醇 、 六甲基磷酰三胺 、 二氯甲烷 、 甲苯 、 苯 为溶剂， 反应 31.0h， 生成 3-aza-3-methyl-4-phenylbicyclo[4.4.0]decan-2-one
  参考文献：
  名称：

  A One-Pot Bicycloannulation Method for the Synthesis of Tetrahydroisoquinoline Systems

  摘要：

  A highly effective method for the synthesis of the core indolo[2,3-a]quinolizidine skeleton found in yohimbine is described. The reaction of N-monosubstituted thioamides with bromoalkenoyl chlorides furnishes thioisomunchnones as transient 1,3-dipoles that undergo ready intramolecular cycloaddition across the tethered pi-bond to give thio-bicycloannulated products in a one-pot operation. The stereochemical outcome of the intramolecular reaction is the consequence of an endo cycloaddition of the neighboring-bond across the transient thioisomunchnone dipole. A major limitation of the method is that when a hydrogen is present in the alpha-position of the thioamide the initially formed thio-N-acyliminium ion undergoes proton loss to produce a S ,N-ketene acetal at a faster rate than dipole formation. Treatment of tetrahydro-beta-carboline-1-thione with 2-bromooct-7-enoyl chloride followed by reductive removal of sulfur from the cycloadduct resulted in the formation of (+/-)-alloyahimbanone. Attempts to cycloadd the thioisomunchnone dipole across several nucleophilic-bonds failed, and instead, products derived from cyclization of the pi-bond onto the initially formed thio-N-acyliminium ion were formed. The resulting N,S-ketals were further converted into several tetrahydroisoquinoline alkaloids in good yield.

  DOI：

  10.1021/jo991742h

文献信息

• A One-Pot Bicycloannulation Method for the Synthesis of Tetrahydroisoquinoline Systems
  作者：Albert Padwa、L. Scott Beall、Todd M. Heidelbaugh、Bing Liu、Scott M. Sheehan

  DOI：10.1021/jo991742h

  日期：2000.5.1

  A highly effective method for the synthesis of the core indolo[2,3-a]quinolizidine skeleton found in yohimbine is described. The reaction of N-monosubstituted thioamides with bromoalkenoyl chlorides furnishes thioisomunchnones as transient 1,3-dipoles that undergo ready intramolecular cycloaddition across the tethered pi-bond to give thio-bicycloannulated products in a one-pot operation. The stereochemical outcome of the intramolecular reaction is the consequence of an endo cycloaddition of the neighboring-bond across the transient thioisomunchnone dipole. A major limitation of the method is that when a hydrogen is present in the alpha-position of the thioamide the initially formed thio-N-acyliminium ion undergoes proton loss to produce a S ,N-ketene acetal at a faster rate than dipole formation. Treatment of tetrahydro-beta-carboline-1-thione with 2-bromooct-7-enoyl chloride followed by reductive removal of sulfur from the cycloadduct resulted in the formation of (+/-)-alloyahimbanone. Attempts to cycloadd the thioisomunchnone dipole across several nucleophilic-bonds failed, and instead, products derived from cyclization of the pi-bond onto the initially formed thio-N-acyliminium ion were formed. The resulting N,S-ketals were further converted into several tetrahydroisoquinoline alkaloids in good yield.