(-)-(1S,4S,5R,6S,9R)-4-acetyl-6-methyl-9-isopropyl-2-oxabicyclo<4.3.0>nonan-3-one | 146143-50-2

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 异戊烯醇脂质
• 英文名称: (-)-(1S,4S,5R,6S,9R)-4-acetyl-6-methyl-9-isopropyl-2-oxabicyclo<4.3.0>nonan-3-one
• 英文别名: (3S,3aR,4R,7S,7aS)-3-acetyl-hexahydro-7-isopropyl-4-methyl-benzofuran-2(3H)-one；(3S,3aR,4R,7S,7aS)-3-acetyl-4-methyl-7-propan-2-yl-3a,4,5,6,7,7a-hexahydro-3H-1-benzofuran-2-one
• CAS: 146143-50-2
• 化学式: C₁₄H₂₂O₃
• 分子量: 238.327
• InChiKey: GGRKJLRQUDAOEB-GIVNFFOOSA-N

物化性质

• 沸点：
  370.8±25.0 °C(predicted)
• 密度：
  1.029±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.2
• 重原子数：
  17
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.86
• 拓扑面积：
  43.4
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  3-氧代丁酸 (1R,2S,5R)-5-甲基-2-(1-甲基乙基)环己基酯 在 dirhodium tetraacetate 三乙胺 、 甲烷磺酰基叠氮化物 作用下， 以 乙腈 、 苯 为溶剂， 反应 10.0h， 生成 (-)-(1S,4S,5R,6S,9R)-4-acetyl-6-methyl-9-isopropyl-2-oxabicyclo<4.3.0>nonan-3-one
  参考文献：
  名称：

  Electronic and steric control in carbon-hydrogen insertion reactions of diazoacetoacetates catalyzed by dirhodium(II) carboxylates and carboxamides

  摘要：

  Carboxylate and carboxamide ligands on dirhodium(II) catalysts can provide enormous regiocontrol in carbon-hydrogen insertion reactions of diazoacetate esters. Whereas 2,3,4-trimethyl-3-pentyl diazoacetoacetate (1) forms gamma-lactone products from insertion into primary and tertiary C-H bonds in a statistical distribution (61:39) with dirhodium(II) tetrakis(perfluorobutyrate), only tertiary C-H insertion is observed with dirhodium(II) tetraacetamide. Similar results are obtained with 2-methyl-2-octyl diazoacetoacetate (3), where competition for insertion exists between secondary and primary C-H bonds and electronic factors govern regioselection. However, with 2-methyl-3-isopropyl-3-heptyl diazoacetoacetate (2) and 2-methyl-1-phenyl-2-propyl diazoacetoacetate (4), product distributions from C-H insertion are invariant with the dirhodium(II) ligands; insertion into a secondary C-H bond is favored over tertiary C-H insertion with 2 (95:5), and insertion into a primary C-H bond is preferred to benzylic secondary C-H insertion with 4 (70:30). In such cases, which are amenable to analyses by MM2 calculations, regioselectivity is determined by conformational preferences for which C-H insertion selectivity can be as random as that found with 2 and 4. When only one C-H bond site is available for insertion to form a five-membered ring product, only one gamma-lactone is observed from reactions catalyzed by dirhodium(II) tetraacetate, and that product is not necessarily the one predicted by presumed electronic preferences.

  DOI：

  10.1021/ja00056a021

文献信息

• Catalyzed addition of diazoacetoacetates to imines: synthesis of highly functionalized aziridines
  作者：Xue-jing Zhang、Ming Yan、Dan Huang

  DOI：10.1039/b813763c

  日期：——

  The addition of diazoacetoacetates to aromatic imines derived from p-methoxyaniline is achieved using dirhodium tetraacetate as the catalyst. Highly functionalized aziridines are obtained in good yield and with excellent stereoselectivity. 2-Diazo-1,3-diketones also provide good yields of aziridines, but dimethyl diazomalonate is inactive in the transformation. The diazoacetoacetates of chiral alcohols are also examined in the reaction and moderate diastereoselectivity is achieved with (R)-pantolactone-derived diazoacetoacetate. A reaction mechanism through metal-carbene and azomethine ylide is proposed.

  将二氮基乙酸酯添加到由对甲氧基苯胺衍生的芳香亚胺中，使用四乙酸二铑作为催化剂。可以获得高度功能化的氮杂环丙烯，产率良好且立体选择性优异。2-二氮基-1,3-二酮也能提供良好的氮杂环丙烯产率，但二甲基二氮基马来酸酯在此转化中无活性。还对手性醇的二氮基乙酸酯进行了反应研究，使用(R)-潘托乳酸衍生的二氮基乙酸酯实现了中等的非对映选择性。提出了一种通过金属-烯烃和亚胺亚氢化物的反应机制。
• Highly selective γ-lactone syntheses by intramolecular carbenoid carbon-hydrogen insertion in rhodium(II) carboxylate and rhodium(II) carboxamide catalyzed reactions of diazo esters
  作者：Michael P. Doyle、Vahid Bagheri、Matthew M. Pearson、John D. Edwards

  DOI：10.1016/s0040-4039(01)93408-2

  日期：——

  Rhodium(II) acetate and rhodium(II) acetamide catalyzed decomposition of diazo esters forms γ-lactones in high yield and with exceptionally high regio- and diastereoselectivity.

  乙酸铑（II）和铑（II）乙酰胺催化的重氮酯分解形成γ-内酯，产率高，区域选择性和非对映选择性高。