(5R,6S)-5,6-Dimethyl-6-vinyl-3,4,5,6-tetrahydro-2H-pyran-2-one | 105835-11-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 内酯类
• 英文名称: (5R,6S)-5,6-Dimethyl-6-vinyl-3,4,5,6-tetrahydro-2H-pyran-2-one
• 英文别名: (4R,5S)-4,5-Dimethyl-5-vinyl-5-pentanolide；(5R,6S)-6-ethenyl-5,6-dimethyloxan-2-one
• CAS: 105835-11-8
• 化学式: C₉H₁₄O₂
• 分子量: 154.209
• InChiKey: UQZVPXWAOWLFKL-APPZFPTMSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.8
• 重原子数：
  11
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (5R,6S)-5,6-Dimethyl-6-vinyl-3,4,5,6-tetrahydro-2H-pyran-2-one 在 ruthenium trichloride 、 sodium periodate 作用下， 以 四氯化碳 、 水 、 乙腈 为溶剂， 反应 3.0h， 以73%的产率得到(4R,5R)-5-Carboxy-4,5-dimethyl-5-pentanolide
  参考文献：
  名称：

  Stereoselective synthesis of the pyrrolizidine alkaloids (-)-integerrimine and (+)-usaramine

  摘要：

  Two routes to the pyrrolizidine alkaloid (-)-integerrimine (1) are described. The first, starting from methyl (R)-(-)-3-hydroxy-2-methylpropionate, proceeded in 19 steps to integerrinecic acid lactone (5) which was transformed to the necic acid derivative 30. The latter was coupled to protected retronecine 31, and the synthesis of 1 was completed by lactonization employing Vedejs' protocol. A second, shorter synthesis of (-)-1 was accomplished via 5, starting from (R)-(+)-beta-citronellol (36). This pathway invoked Katsuki-Sharpless epoxidation of 42 for stereoselective construction of the tertiary alcohol of integerrinecic acid. A parallel sequence proceeding via the stereoisomeric epoxide 44 led to the necic acid segment 75 of the alkaloid (+)-usaramine (2). This acid was coupled to the retronecine borane 82 and then lactonized to 2.

  DOI：

  10.1021/jo00034a017
• 作为产物：
  描述：

  (3S,4S)-3-Acetoxy-3,4-dimethyl-5-iodo-1-pentene 在 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 正己烷 为溶剂， 反应 1.0h， 以94%的产率得到(5R,6S)-5,6-Dimethyl-6-vinyl-3,4,5,6-tetrahydro-2H-pyran-2-one
  参考文献：
  名称：

  Stereoselective synthesis of the pyrrolizidine alkaloids (-)-integerrimine and (+)-usaramine

  摘要：

  Two routes to the pyrrolizidine alkaloid (-)-integerrimine (1) are described. The first, starting from methyl (R)-(-)-3-hydroxy-2-methylpropionate, proceeded in 19 steps to integerrinecic acid lactone (5) which was transformed to the necic acid derivative 30. The latter was coupled to protected retronecine 31, and the synthesis of 1 was completed by lactonization employing Vedejs' protocol. A second, shorter synthesis of (-)-1 was accomplished via 5, starting from (R)-(+)-beta-citronellol (36). This pathway invoked Katsuki-Sharpless epoxidation of 42 for stereoselective construction of the tertiary alcohol of integerrinecic acid. A parallel sequence proceeding via the stereoisomeric epoxide 44 led to the necic acid segment 75 of the alkaloid (+)-usaramine (2). This acid was coupled to the retronecine borane 82 and then lactonized to 2.

  DOI：

  10.1021/jo00034a017

文献信息

• Chiral synthesis of the necic acid components, crobarbatic acid and integerrinecic acid lactone
  作者：Toshio Honda、Fumihiro Ishikawa、Shin-ichi Yamane

  DOI：10.1039/p19960001125

  日期：——

  Samarium(II) diiodide-promoted regioselective fragmentation of the γ-halogeno esters 12 and 13 afforded the olefins 14 and 20, respectively, which were converted into the necic acid components, crobarbatic acid and a known advanced intermediate of integerrinecic acid lactone, of macropyrrolizidine alkaloids.

  二碘化钐(II)促进γ-卤代酯12和13的区域选择性裂解，分别得到烯烃14和20，它们被转化为大环吡咯里西啶的neic酸组分、crobarbatic酸和已知的interinecic酸内酯的高级中间体生物碱。
• Synthesis of the macrolactone pyrrolizidine alkaloid integerrimine
  作者：James D. White、Susumu Ohira

  DOI：10.1021/jo00376a104

  日期：1986.12
• Stereoselective synthesis of the pyrrolizidine alkaloids (-)-integerrimine and (+)-usaramine
  作者：James D. White、John C. Amedio、Samuel Gut、Susumu Ohira、Lalith R. Jayasinghe

  DOI：10.1021/jo00034a017

  日期：1992.4

  Two routes to the pyrrolizidine alkaloid (-)-integerrimine (1) are described. The first, starting from methyl (R)-(-)-3-hydroxy-2-methylpropionate, proceeded in 19 steps to integerrinecic acid lactone (5) which was transformed to the necic acid derivative 30. The latter was coupled to protected retronecine 31, and the synthesis of 1 was completed by lactonization employing Vedejs' protocol. A second, shorter synthesis of (-)-1 was accomplished via 5, starting from (R)-(+)-beta-citronellol (36). This pathway invoked Katsuki-Sharpless epoxidation of 42 for stereoselective construction of the tertiary alcohol of integerrinecic acid. A parallel sequence proceeding via the stereoisomeric epoxide 44 led to the necic acid segment 75 of the alkaloid (+)-usaramine (2). This acid was coupled to the retronecine borane 82 and then lactonized to 2.