2-allyl-3-bromo-cyclohex-2-enone | 56745-18-7

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2-allyl-3-bromo-cyclohex-2-enone
• 英文别名: 2-allyl-3-bromo-2-cyclohexenone；2-allyl-3-bromocyclohex-2-en-1-one；3-bromo-2-prop-2-enylcyclohex-2-en-1-one
• CAS: 56745-18-7
• 化学式: C₉H₁₁BrO
• 分子量: 215.09
• InChiKey: OEDYLEMJYOGCNA-UHFFFAOYSA-N

物化性质

• 沸点：
  256.8±40.0 °C(Predicted)
• 密度：
  1.380±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.4
• 重原子数：
  11
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.44
• 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：

  2-allyl-3-bromo-cyclohex-2-enone 在 碘 作用下， 以 异丙醇 为溶剂， 生成
  参考文献：
  名称：

  有效合成取代的2-甲基苯并呋喃

  摘要：

  描述了通过在碘存在下可及的烯丙基取代的环己-2-烯酮的芳构化，然后将2-碘甲基-2,3-二氢苯并呋喃中间体脱氢碘化，来有效合成取代的2-甲基苯并呋喃。

  DOI：

  10.1007/s10593-019-02443-3
• 作为产物：
  描述：

  2-烯丙基-1,3-环己二酮 在 三乙胺 、 二溴三苯基膦 作用下， 以 苯 为溶剂， 反应 3.0h， 以96%的产率得到2-allyl-3-bromo-cyclohex-2-enone
  参考文献：
  名称：

  Synthesis of β-chloro, β-bromo, and β-iodo α,β-unsaturated ketones

  摘要：

  描述了一种制备β-氯、β-溴和β-碘α，β-不饱和酮的新的高效方法。该方法涉及β-二酮或α-羟甲基环戊酮与三苯基膦二卤化物在三乙胺存在下的反应。对于二氯化物和二溴化物试剂，反应通常在苯中室温下进行，而对于三苯基膦二碘化物，最好在回流的乙腈（β-二酮）或乙腈-六甲基磷酰胺（α-羟甲基环戊酮）中进行。三苯基膦二碘化物-三乙胺与一系列4-烷基-1,3-环己二酮的反应主要或仅产生（取决于烷基的大小）6-烷基-3-碘-2-环己烯-1-酮，而该试剂与2-羟甲基环己酮和2-羟甲基环戊酮的反应分别选择性地产生（E）-2-碘甲基环己酮和（E）-2-碘甲基环戊酮。

  DOI：

  10.1139/v82-033

文献信息

• Reaction of β-halo α, β-unsaturated ketones with cuprate reagents. Efficient syntheses of β, β-dialkyl ketones and β-alkyl α,β-unsaturated ketones. A synthesis of (<i>Z</i>)-jasmone
  作者：Edward Piers、Kin Fai Cheng、Isao Nagakura

  DOI：10.1139/v82-185

  日期：1982.5.15

  Treatment of the 3-halo-2-cyclohexen-1-ones 11–15 and 17 with an excess of lithium dimethylcuprate provided good to excellent yields of the corresponding 3,3-dimethylcyclohexanones 21–24. Similar reactions involving the β-bromo cyclopentenones 19 and 20 stopped at the monoaddition stage, producing the cyclopentenones 40 and 43. Reaction of the β-bromo cyclohexenones 12 and 15 with 1.1 equiv. of lithium dimethylcuprate did not effect clean conversion of these substrates into the corresponding 3-methyl-2-cyclohexen-1-ones. When a series of β-bromo enones 12, 14–19 were allowed to react with the lithium (phenylthio)(alkyl)cuprates 44–47, the corresponding β-alkyl enones were, in general, produced cleanly and efficiently. However, reaction of 3-bromo-2-methyl-2-cyclopenten-1-one (19) with the cuprate reagent 44 gave mainly the β-phenylthio enone 49. This undesired result could be avoided by employing, in the place of 19, the β-iodo cyclopentenone 50, which reacted smoothly with 44 to give a high yield of 2,3-dimefhyl-2-cyclopenten-1-one (40). Reaction of 3-bromo-2-cyclohexen-1-one (14) with 3 equiv. of the mixed vinylcuprate reagent 48 gave 3-(3-butenyl)-2-cyclohexen-1-one (32). Alkylation of 1,3-cyclopentanedione with (Z)-1-chloro-2-pentene afforded compound 51, which was converted into the β-bromo enone 52. Treatment of the latter substance with lithium dimethylcuprate provided (Z)-jasmone (53).

  将3-卤代-2-环己烯-1-酮11-15和17与过量的二甲基溴化锂处理，得到相应的3,3-二甲基环己酮21-24，收率良好至优良。涉及β-溴代环戊烯酮19和20的类似反应在单加成阶段停止，产生环戊烯酮40和43。β-溴代环己烯酮12和15与1.1当量的二甲基溴化锂反应未对这些底物进行干净转化为相应的3-甲基-2-环己烯-1-酮产生影响。当一系列β-溴代烯酮12、14-19与苯基硫代烷基铜盐44-47反应时，通常产生相应的β-烷基烯酮，而且效率高。然而，3-溴代-2-甲基-2-环戊烯-1-酮（19）与铜盐试剂44反应主要产生β-苯基硫代烯酮49。通过使用β-碘代环戊烯酮50代替19，可以避免这种不良结果，后者与44反应顺利，产生高收率的2,3-二甲基-2-环戊烯-1-酮（40）。3-溴代-2-环己烯-1-酮（14）与混合乙烯铜盐试剂48的3当量反应产生3-(3-丁烯基)-2-环己烯-1-酮（32）。1,3-环戊二酮与(Z)-1-氯-2-戊烯烷基化生成化合物51，进一步转化为β-溴代烯酮52。后一物质经二甲基溴化锂处理得到(Z)-茉莉酮（53）。
• Synthesis of β-chloro, β-bromo, and β-iodo α,β-unsaturated ketones
  作者：Edward Piers、John R. Grierson、Cheuk Kun Lau、Isao Nagakura

  DOI：10.1139/v82-033

  日期：1982.1.15

  A new, efficient method for the preparation of β-chloro, β-bromo, and β-iodo α,β-unsaturated ketones is described. The method involves the reaction of β-diketones or α-hydroxymethylenecycloalkanones with triphenylphosphine dihalides in the presence of triethylamine. With the dichloride and dibromide reagents, the reactions are conveniently carried out in benzene at room temperature, while with triphenylphosphine diiodide the reactions are best performed in refluxing acetonitrile (β-diketones) or in acetonitrile–hexamethylphosphoramide (α-hydroxymethylenecycloalkanones). The reaction of triphenylphosphine diiodide – triethylamine with a series of 4-alkyl-1,3-cyclohexanediones provides mainly or exclusively (depending on the size of the alkyl group) 6-alkyl-3-iodo-2-cyclohexen-1-ones, while reaction of this reagent with 2-hydroxymethylenecyclohexanone and 2-hydroxymethylenecyclopentanone affords stereoselectively and regioselectively (E)-2-iodomethylenecyclohexanone and (E)-2-iodomethylenecyclopentanone, respectively.

  描述了一种制备β-氯、β-溴和β-碘α，β-不饱和酮的新的高效方法。该方法涉及β-二酮或α-羟甲基环戊酮与三苯基膦二卤化物在三乙胺存在下的反应。对于二氯化物和二溴化物试剂，反应通常在苯中室温下进行，而对于三苯基膦二碘化物，最好在回流的乙腈（β-二酮）或乙腈-六甲基磷酰胺（α-羟甲基环戊酮）中进行。三苯基膦二碘化物-三乙胺与一系列4-烷基-1,3-环己二酮的反应主要或仅产生（取决于烷基的大小）6-烷基-3-碘-2-环己烯-1-酮，而该试剂与2-羟甲基环己酮和2-羟甲基环戊酮的反应分别选择性地产生（E）-2-碘甲基环己酮和（E）-2-碘甲基环戊酮。
• A multi-component coupling approach to benzo[b]furans and indoles
  作者：Jason H. Chaplin、Bernard L. Flynn

  DOI：10.1039/b104624c

  日期：——

  A single step access to multiply substituted benzo[b]furans and indoles has been developed.

  开发出了一种一步法获取多取代苯并[b]呋喃和吲哚的方法。
• Multicomponent Coupling Approach to (±)-Frondosin B and a Ring-Expanded Analogue
  作者：Daniel J. Kerr、Anthony C. Willis、Bernard L. Flynn

  DOI：10.1021/ol035822q

  日期：2004.2.1

  A recently discovered multicomponent coupling reaction is used to give direct access to a late intermediate in the synthesis of frondosin B. This intermediate can also be efficiently converted to a ring-expanded analogue of frondosin B by sustained heating of the reaction mixture. An unprecedented tandem 1,7-hydrogen shift, 8pi-electrocyclization is proposed to explain the formation of this ring-expanded species.
• A Concise Approach to the Polycyclic Scaffold of Frondosin D
  作者：Kye-Simeon Masters、Bernard L. Flynn

  DOI：10.1021/jo800682n

  日期：2008.10.17

  In a study directed at developing a concise approach to the polycyclic core of frondosin D, a Stille-Heck sequence has been identified that gives direct access to the trimethylbicyclo [5.4.0]undecane ring system common to all frondosins.