(R,E)-methyl 5-(benzyldimethylsilyl)-2-methylpent-4-enoate | 1259286-26-4

• 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: (R,E)-methyl 5-(benzyldimethylsilyl)-2-methylpent-4-enoate
• 英文别名: methyl (E,2R)-5-[benzyl(dimethyl)silyl]-2-methylpent-4-enoate
• CAS: 1259286-26-4
• 化学式: C₁₆H₂₄O₂Si
• 分子量: 276.451
• InChiKey: KUDDZBKIQBUBCM-CEFACKQISA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.77
• 重原子数：
  19
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.44
• 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：

  (R,E)-methyl 5-(benzyldimethylsilyl)-2-methylpent-4-enoate 在 tris(dibenzylideneacetone)dipalladium(0) chloroform complex 、 萘 、 四丁基氟化铵 、 水 、 lithium hydroxide 作用下， 以 四氢呋喃 、 甲醇 、 水 为溶剂， 反应 9.0h， 生成 (2S,3S,4Z)-1-(4-methylphenylsulfonyl)-2-carboxy-4-[(2E,5R)-5-carboxy-1-methyl-2-hexen-1-ylidene]-3-pyrrolidineacetic acid
  参考文献：
  名称：

  Stereocontrolled Total Syntheses of Isodomoic Acids G and H via a Unified Strategy

  摘要：

  Marine neuroexcitatory compounds isodomoic acids G and H were efficiently synthesized from a common intermediate using a silicon-based cross-coupling reaction. Dividing each target compound into the core fragment and the side-chain fragment enabled the synthesis to be convergent. The trans-2,3-disubstituted pyrrolidine core fragment was accessed through a diastereoselective rhodium-catalyzed carbonylative silylcarbocyclization reaction of a vinylglycine-derived 1,6-enyne. A stereochemically divergent desilylative iodination reaction was developed to convert the cyclization product to both E- and Z-alkenyl iodides, which would eventually lead to isodomoic acid G and isodomoic acid H, respectively. The late-stage alkenyl alkenyl silicon-based cross-coupling reaction uniting the core alkenyl iodides and the side-chain alkenylsilanol was achieved under mild conditions. Finally, two mild deprotections afforded the target molecules.

  DOI：

  10.1021/jo101790z
• 作为产物：
  描述：

  (S)-4-benzyl-3-((R)-2-methylpent-4-ynoyl)oxazolidin-2-one 、 苄基二甲基硅烷 在 sodium methylate 作用下， 以 四氢呋喃 、 5,5-dimethyl-1,3-cyclohexadiene 、 二氯甲烷 为溶剂， 反应 7.0h， 生成 (R,E)-methyl 5-(benzyldimethylsilyl)-2-methylpent-4-enoate
  参考文献：
  名称：

  Stereocontrolled Total Syntheses of Isodomoic Acids G and H via a Unified Strategy

  摘要：

  Marine neuroexcitatory compounds isodomoic acids G and H were efficiently synthesized from a common intermediate using a silicon-based cross-coupling reaction. Dividing each target compound into the core fragment and the side-chain fragment enabled the synthesis to be convergent. The trans-2,3-disubstituted pyrrolidine core fragment was accessed through a diastereoselective rhodium-catalyzed carbonylative silylcarbocyclization reaction of a vinylglycine-derived 1,6-enyne. A stereochemically divergent desilylative iodination reaction was developed to convert the cyclization product to both E- and Z-alkenyl iodides, which would eventually lead to isodomoic acid G and isodomoic acid H, respectively. The late-stage alkenyl alkenyl silicon-based cross-coupling reaction uniting the core alkenyl iodides and the side-chain alkenylsilanol was achieved under mild conditions. Finally, two mild deprotections afforded the target molecules.

  DOI：

  10.1021/jo101790z

文献信息

• Stereocontrolled Total Syntheses of Isodomoic Acids G and H via a Unified Strategy
  作者：Scott E. Denmark、Jack Hung-Chang Liu、Joseck M. Muhuhi

  DOI：10.1021/jo101790z

  日期：2011.1.7

  Marine neuroexcitatory compounds isodomoic acids G and H were efficiently synthesized from a common intermediate using a silicon-based cross-coupling reaction. Dividing each target compound into the core fragment and the side-chain fragment enabled the synthesis to be convergent. The trans-2,3-disubstituted pyrrolidine core fragment was accessed through a diastereoselective rhodium-catalyzed carbonylative silylcarbocyclization reaction of a vinylglycine-derived 1,6-enyne. A stereochemically divergent desilylative iodination reaction was developed to convert the cyclization product to both E- and Z-alkenyl iodides, which would eventually lead to isodomoic acid G and isodomoic acid H, respectively. The late-stage alkenyl alkenyl silicon-based cross-coupling reaction uniting the core alkenyl iodides and the side-chain alkenylsilanol was achieved under mild conditions. Finally, two mild deprotections afforded the target molecules.