4-Methyl-2-ethyl-cyclopentanon-(1) | 90112-25-7

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 4-Methyl-2-ethyl-cyclopentanon-(1)
• 英文别名: 2-Ethyl-4-methylcyclopentanone；2-ethyl-4-methylcyclopentan-1-one
• CAS: 90112-25-7
• 化学式: C₈H₁₄O
• 分子量: 126.199
• InChiKey: BPFZPVGRQUXSKY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.8
• 重原子数：
  9
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  4-Methyl-2-ethyl-cyclopentanon-(1) 生成 1-乙基-3-甲基环戊烷
  参考文献：
  名称：

  BELIKOVA N. A.; ORDUBADI M. D.; BOBYLEVA A. A.; DUBITSKAYA N. F.; LOSHKAR+, ZH. ORGAN. XIM., 1979, HO 15, VYP. 2, 320-327

  摘要：

  DOI：
• 作为产物：
  描述：

  3,5-Dimethyl-5-vinyl-Δ²-cyclopentenon-(1) 在 palladium on activated charcoal 、 铂 氢气 作用下， 生成 4-Methyl-2-ethyl-cyclopentanon-(1)
  参考文献：
  名称：

  Chemistry of cyclopentenones

  摘要：

  DOI：

  10.1007/bf00911368

文献信息

• Cyclic ketones, their preparation and their use in the synthesis of amino acids
  申请人：——

  公开号：US20030187296A1

  公开（公告）日：2003-10-02

  A method is provided for making an enantiomerically pure of the formula: in which R and R′ represent C1?C10 alkyl, C2?C10 alkenyl or C3?C10 cycloalkyl and the wedges signify (S)- or (R)-stereochemistry, the substituents in compound (II) being trans. Conjugate addition is carried out between an organometallic nucleophile that provides a group R as defined above and (R)-4-acetoxycyclopent-2-en-1-one, (S)-4-acetoxycyclopent-2-en-1-one or a similar compound in which acetoxy is replaced by another leaving group to give, e.g. in the case of the acetoxy compound, a trans 3,4-disubstituted addition product of formula III or IV; The acetyl group is eliminated from the addition product to give an (R)- or (S)-4-alkyl or 4-alkenyl cyclopent-2-en-1-one the compound of formula is then to be hydrogenated to give a cyclopentanone of formula (I) or conjugate addition of a second organometallic nucleophile that provides a group R′ as defined above to the compound of the above formula may be carried out to give a trans 3,4-disubstituted addition product of formula (II). One of the above compounds may be converted e.g. via an intermediate (XV)-(XVIII) (in which the substituents R and R′ and the wedges have the meanings indicated above) to a gabapentin analogue of one of the formulae shown below: in which the substituents R and R′ and the wedges also have the meanings indicated above. 1 2

  提供一种制备公式的对映纯物质的方法：其中R和R′代表C1-C10烷基、C2-C10烯基或C3-C10环烷基，楔形符号表示(S)-或(R)-立体化学，化合物(II)中的取代基为反式。在有机金属亲核试剂和(R)-4-乙酰氧基环戊-2-烯-1-酮、(S)-4-乙酰氧基环戊-2-烯-1-酮或类似化合物之间进行共轭加成，其中乙酰氧基被另一个离去基取代，例如在乙酰氧基化合物的情况下，得到公式III或IV的反式3,4-二取代加成产物；从加成产物中消除乙酰基，得到(R)-或(S)-4-烷基或4-烯基环戊-2-烯-1-酮，然后将该化合物氢化，得到公式(I)的环戊酮，或者对上述公式的化合物进行第二次有机金属亲核试剂的共轭加成，得到公式(II)的反式3,4-二取代加成产物。上述化合物之一可以通过中间体(XV)-(XVIII)（其中取代基R和R′以及楔形符号具有上述所示的含义）转化为下面所示的公式之一的加巴喷丁类似物：其中取代基R和R′以及楔形符号也具有上述所示的含义。
• Regioselective ketone α-alkylation with simple olefins via dual activation
  作者：Fanyang Mo、Guangbin Dong

  DOI：10.1126/science.1254465

  日期：2014.7.4

  C-H bonds of ketones. Traditional methods to form such products rely on the preliminary reaction of the ketone with a base, followed by subsequent reaction with an alkyl halide. The authors used a ligand that simultaneously activates the ketone and guides the catalytic rhodium to the right location. This approach removes the need for the other reagents and eliminates the associated halide salt byproducts

  无副产品的碳-碳键 环境和成本问题正在推动化学方法的发展，以最大限度地减少副产品的形成。在这方面，Mo 和 Dong 提出了一种将烯烃（如乙烯）直接插入到酮的 CH 键中的催化剂。形成此类产品的传统方法依赖于酮与碱的初步反应，随后与烷基卤反应。作者使用了一种配体，可以同时激活酮并将催化铑引导到正确的位置。这种方法消除了对其他试剂的需要，并消除了相关的卤化物盐副产物。科学，这个问题 p。68 铑催化剂通过将烯烃插入到酮的 CH 键中来使酮烷基化，从而消除副产物的形成。羰基化合物的烷基化是一种常用的碳-碳键形成反应。然而，由于缺乏区域选择性、过度烷基化的风险以及需要强碱性条件和昂贵的烷基卤化物试剂，传统的烯醇烷基化方法仍然存在问题。在这里，我们描述了使用简单烯烃作为烷基化剂的酮烷基化策略的开发。该策略采用双功能催化剂，该催化剂包含仲胺和能够同时活化酮和烯烃的低价铑配合物。环状和无环酮都可以用简
• CYCLIC KETONES, THEIR PREPARATION AND THEIR USE IN THE SYNTHESIS OF AMINO ACIDS
  申请人：WARNER-LAMBERT COMPANY

  公开号：EP1296921A1

  公开（公告）日：2003-04-02
• US6872856B2
  申请人：——

  公开号：US6872856B2

  公开（公告）日：2005-03-29
• [EN] CYCLIC KETONES, THEIR PREPARATION AND THEIR USE IN THE SYNTHESIS OF AMINO ACIDS<br/>[FR] CETONES CYCLIQUES, LEUR PREPARATION ET LEUR UTILISATION DANS LA SYNTHESE D'ACIDES AMINES
  申请人：WARNER LAMBERT CO

  公开号：WO2002000584A1

  公开（公告）日：2002-01-03

  A method is provided for making an enantiomerically pure compound of the formula: in which R and R' represent C1?C10 alkyl, C2?C10 alkenyl or C3?C10 cycloalkyl and the wedges signify (S)- or (R)- stereochemistry, the substituents in compound (II) being trans. Conjugate addition is carried out between an organometallic nucleophile that provides a group R as defined above and (R)-4-acetoxycyclopent-2-en-1-one, (S)- 4-acetoxycyclopent-2-en-1-one or a similar compound in which acetoxy is replaced by another leaving group to give, e.g. in the case of the acetoxy compound, a trans 3,4-disubstituted addition product of formula III or IV; The acetyl group is eliminated from the addition product to give an (R)- or (S)- 4-alkyl or 4-alkenyl cyclopent-2-en-1-one the compound of formula is then to be hydrogenated to give a cyclopentanone of formula (I) or conjugate addition of a second organometallic nucleophile that provides a group R' as defined above to the compound of the above formula may be carried out to give a trans 3,4-disubstituted addition product of formula (II). One of the above compounds may be converted e.g. via an intermediate (XV)-(XVIII) (in which the substituents R and R' and the wedges have the meanings indicated above) to a gabapentin analogue of one of the formulae shown below: in which the substituents R and R' and the wedges also have the meanings indicated above.