ethyl 1-bromo-2-oxocyclopentanecarboxylate | 42593-11-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: ethyl 1-bromo-2-oxocyclopentanecarboxylate
• 英文别名: 2-bromo-2-ethoxy carbonylcyclopentanone；2-bromo-2-ethoxycarbonylcyclopentanone；ethyl 1-bromo-2-oxocyclopentane-1-carboxylate
• CAS: 42593-11-3
• 化学式: C₈H₁₁BrO₃
• 分子量: 235.078
• InChiKey: FKRCXCLQKNMFQT-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  12
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  43.4
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  ethyl 1-bromo-2-oxocyclopentanecarboxylate 在 水 、 1-methyl-3-pentyl-1H-imidazolium tetrafluoroborate 作用下， 125.0 ℃ 、344.74 kPa 条件下， 反应 0.03h， 以70%的产率得到2-氧代环戊羧酸乙酯
  参考文献：
  名称：

  Ionic liquid promoted selective debromination of α-bromoketones under microwave irradiation

  摘要：

  The debrontination of alpha-bromoketones with an easily accessible ionic liquid, 1-methyl-3-pentylimidazolium tetrafluoroborate, [pmIm]BF4 under microwave irradiation has been investigated. By controlling the reaction time gem-alpha-dibromoketones are selectively debrominated to either monobromo or debromoketones. The alpha-monobromo- and alpha-monoiodoketones are dehalogenated while the corresponding chloroketones remain inert. The activated vic-bromoacetates are converted to the corresponding (E)-alkenes by the same procedure. These reactions do not require any organic solvent, any metal or any conventional reducing agent. The ionic liquid works here as catalyst as well as reaction medium and is recycled without any appreciable loss of its catalytic efficiency. (c) 2006 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2006.10.035
• 作为产物：
  描述：

  2-乙酰氧基-1-环戊烯-1-羧酸乙酯 在 溴 、 magnesium oxide 作用下， 生成 ethyl 1-bromo-2-oxocyclopentanecarboxylate
  参考文献：
  名称：

  Synthesis of 3-carbethoxybicyclo[2.1.0]-2-pentanone

  摘要：

  DOI：

  10.1007/bf00854246

文献信息

• Halogenation of Carbonyl Compounds by an Ionic Liquid, [AcMIm]X, and Ceric Ammonium Nitrate (CAN)
  作者：Brindaban C. Ranu、Laksmikanta Adak、Subhash Banerjee

  DOI：10.1071/ch07061

  日期：——

  An ionic liquid, acetylmethylimidazolium halide ([AcMIm]X), in combination with ceric ammonium nitrate promotes halogenations of a wide variety of ketones and 1,3-keto esters at the α-position. The ionic liquid acts here as reagent as well as reaction medium, and thus the reaction does not require any organic solvent or conventional halogenating agent. The reaction is completely arrested when the radical

  离子液体乙酰甲基咪唑鎓卤化物 ([AcMIm]X) 与硝酸铈铵结合可促进多种酮和 1,3-酮酯在 α 位的卤化。离子液体在此既充当试剂又充当反应介质，因此该反应不需要任何有机溶剂或常规卤化剂。当使用自由基猝灭剂 TEMPO 时，反应完全停止。还提出了一种似是而非的激进机制。
• A mild and environmentally acceptable synthetic protocol for chemoselective α-bromination of β-keto esters and 1,3-diketones
  作者：Abu T. Khan、Papori Goswami、Lokman H. Choudhury

  DOI：10.1016/j.tetlet.2006.02.075

  日期：2006.4

  A wide variety of unsubstituted β-keto esters can be brominated chemoselectively to the corresponding α-monobromo-β-keto esters by using a combination of vanadium pentoxide, hydrogen peroxide and ammonium bromide in a biphasic system, dichloromethane–water at 0–5 °C. In addition, α-mono substituted β-keto esters, cyclic β-keto-esters and 1,3-diketones can also be brominated selectively using the same

  在双相系统中，五氧化二钒，过氧化氢和溴化铵结合使用，二氯甲烷-水在0–5°时，可以将多种未取代的β-酮酯化学选择性地溴化为相应的α-单溴-β-酮酯C。另外，α-单取代的β-酮酯，环状β-酮酯和1，3-二酮也可以使用相同的方案选择性地溴化。
• Enantioselective Halogenation of β-Oxo Esters Catalyzed by a Chiral Sulfoximine-Copper Complex
  作者：Marcus Frings、Carsten Bolm

  DOI：10.1002/ejoc.200900467

  日期：2009.8

  A C1-symmetric amino sulfoximine has been used as a chiral ligand in copper-catalyzed asymmetric halogenation reactions of β-oxo esters. Both the catalyst itself and the reaction conditions were optimized, and 26 fluorinated, chlorinated, and brominated products were obtained with enantioselectivities of up to 91 % ee in yields of up to 99 %. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany

  在铜催化的 β-氧代酯的不对称卤化反应中，C1 对称氨基亚砜亚胺已用作手性配体。对催化剂本身和反应条件进行了优化，获得了 26 种氟化、氯化和溴化产物，对映选择性高达 91% ee，产率高达 99%。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
• Synthesis and Biological Applications of Some Novel Spiro Heterocycles Containing 1,3,4-Thiadiazine, Thiazole, and Oxazole Derivatives
  作者：Vijay V. Dabholkar、Nitin V. Bhusari

  DOI：10.1002/jhet.956

  日期：2013.1

  carbonylcyclopentanone (1) has been brominated to yield 2‐bromo‐2‐ethoxy carbonylcyclopentanone (2) which on further reaction with substituted thiosemicarbazones, thiocarbohydrazones, thiocarbamides and carbamides has furnished 1‐thia‐3,4‐diaza‐5,7‐dioxo‐2‐[(substituted benzylidine)‐amino]spiro[4.5]dec‐2‐ene (3a–e), 1‐thia‐3,4‐diaza‐5,7‐dioxo‐2‐[(substituted benzylidine)‐hydrazino] spiro[4.5]dec‐2‐ene (4a–e), 1‐thia

  2-乙氧基carbonylcyclopentanone （1）已经被溴化，得到2-溴-2-乙氧基carbonylcyclopentanone （2） ，将其用取代的缩氨基硫脲，thiocarbohydrazones，thiocarbamides和carbamides进一步反应提供装饰1 -硫杂-3,4-二氮杂- 5， 7-二氧代-2-[[（取代的苄基）-氨基] spiro [ 4.5 ] dec-2-烯（3a-e），1-硫代-3,4-二氮杂-5,7-二氧代-2-[[取代苄基）-肼基] spiro [ 4.5 ] dec-2-烯（4a-e），1-噻唑-3-氮杂-2-（取代亚氨基）-4,6-二氧代-螺环[ 4.4 ]壬烷（5a–f ）和1-氧杂-3-氮杂-2-（取代的亚氨基）-4,6-二氧杂螺[ 4.4 ]壬烷（6a–g）分别。在光谱分析的基础上阐明了化合物的结构。
• Fang, Li-Zhen; Shen, Jiu-Ming; Lv, Qing-Hua, Asian Journal of Chemistry, 2011, vol. 23, # 8, p. 3425 - 3427
  作者：Fang, Li-Zhen、Shen, Jiu-Ming、Lv, Qing-Hua、Yan, Fu-Lin

  DOI：——

  日期：——