(+/-)-2-fluoro-1-(4-fluorophenyl)ethanol | 40733-93-5

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (+/-)-2-fluoro-1-(4-fluorophenyl)ethanol
• 英文别名: 2-Fluoro-1-(4-fluorophenyl)ethanol；2-fluoro-1-(4-fluorophenyl)ethanol
• CAS: 40733-93-5
• 化学式: C₈H₈F₂O
• 分子量: 158.148
• InChiKey: NFVFMQCVLZOZOH-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  11
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  20.2
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  (+/-)-2-fluoro-1-(4-fluorophenyl)ethanol 、 苯甲酸乙烯酯 在 Novozym 435 作用下， 以 various solvent(s) 为溶剂， 生成 2-fluoro-1-(4-fluorophenyl)ethan-1-ol 、 (R)-2-fluoro-1-(4-fluorophenyl)ethyl benzoate 、 (S)-2-fluoro-1-(4-fluorophenyl)ethyl benzoate
  参考文献：
  名称：

  Asymmetric reduction using (R)-MeCBS and determination of absolute configuration of para-substituted 2-fluoroarylethanols

  摘要：

  The asymmetric reduction of eight alpha-fluoroacetophenones has been investigated using (R)-MeCBS as a catalyst in various media. Based on a solvent screen, 1,2-dimethoxyethane, diethyl ether and dichloromethane were used in reductions of the alpha-fluoroacetophenones. The enantiomeric excess of the products depended oil the solvent and the electronic character of the aromatic substituents. Higher enantioselectivity and less solvent dependency were observed in the reduction of substrates bearing electron donating substituents, whereas the opposite was the case for reduction of the substrates with electron withdrawing substituents. The (R)-2-fluoro-1-arylethanols were obtained with enantiomeric excesses in the range of 91-99% using 1,2-dimethoxyethane as a solvent. Six of the alcohols produced are new chemical entities. The absolute configurations of the (R)-2-fluoro-1-arylethanols were determined by circular dichroism using the exciton chirality method of tile (S)-benzoate esters of the alcohols. The (S)-benzoate esters were obtained by lipase-catalysed resolution using Novozym 435. (C) 2008 Elsevier Ltd. All Fights reserved.

  DOI：

  10.1016/j.tetasy.2008.07.019
• 作为产物：
  描述：

  2-氟-1-(4-氟苯基)-乙酮 在 sodium tetrahydroborate 作用下， 以 甲醇 为溶剂， 生成 (+/-)-2-fluoro-1-(4-fluorophenyl)ethanol
  参考文献：
  名称：

  Synthesis of Enantiopure Fluorohydrins Using Alcohol Dehydrogenases at High Substrate Concentrations

  摘要：

  The use of purified and overexpressed alcohol dehydrogenases to synthesize enantiopure fluorinated alcohols is shown. When the bioreductions were performed with ADH-A from Rhodococcus ruber overexpressed in E. coli, no external cofactor was necessary to obtain the enantiopure (R)-derivatives. Employing Lactobacillus brevis ADH, it was possible to achieve the synthesis of enantiopure (S)-fluorohydrins at a 0.5 M substrate concentration. Furthermore, due to the activated character of these substrates, a huge excess of the hydrogen donor was not necessary.

  DOI：

  10.1021/jo400962c

文献信息

• Palladium-catalyzed intermolecular fluoroesterification of styrenes: exploration and mechanistic insight
  作者：Haihui Peng、Zheliang Yuan、Hao-yang Wang、Yin-long Guo、Guosheng Liu

  DOI：10.1039/c3sc50690h

  日期：——

  A novel palladium-catalyzed intermolecular oxidative fluoroesterification of vinylarenes has been developed using NFSI, one of the mildest electrophilic fluorinating reagents. The reaction presents an efficient synthetic pathway to afford a series of α-monofluoromethylbenzyl carboxylates in good to excellent yields. Rather than following an electrophilic fluorination pathway, the reaction is initiated through oxidation of Pd(0) to a Pd(II) fluoride complex by NFSI, followed by fluoropalladation of a styrene to generate an α-monofluoromethylbenzyl–Pd intermediate. Generally, reductive elimination of benzyl–PdII complexes is favored with relatively strong oxy-nucleophiles to afford C–O bonds. This reaction, however, exhibited the opposite reactivity: strong acids with weak nucleophilicity, such as CF3CO2H and CCl3CO2H, were prone to afford the fluoroesterification product, while weak acids with strong nucleophilicity, such as HOAc and BzOH, did not deliver the C–O bond product. Further mechanistic studies determined that Csp3–Pd(O2CR), a key intermediate, was generated through ionic ligand exchange between benzyl–Pd(NZ2) and CF3CO2H, and the final C–O bond was possibly formed through reductive elimination of a high-valent Csp3–Pd(O2CR) complex via an SN2-type nucleophilic attack pathway.

  一种新型钯催化的乙烯基芳烃分子间氧化性氟酯化反应已被开发，使用的试剂是NFSI，即一种最温和的亲电氟化试剂。该反应提供了一条高效的合成途径，能够以良好至优异的产率获得一系列α-单氟甲基苄基羧酸酯。反应并非遵循亲电氟化途径，而是通过NFSI将Pd(0)氧化为Pd(II)氟化物配合物，随后进行氟钯化作用于苯乙烯生成α-单氟甲基苄基-Pd中间体。通常情况下，与相对较强的氧亲核试剂反应有利于实现苄基-PdII配合物的还原消除，从而形成C-O键。然而，在此反应中表现出了相反的反应性：易与强酸（弱亲核性）如CF3CO2H和CCI3CO2H形成氟酯化产物，而与强亲核性弱酸如HOAc和BzOH则无法形成C-O键产物。进一步的机理研究表明，关键中间体Csp3-Pd(O2CR)是通过苄基-Pd(NZ2)与CF3CO2H之间的离子配体交换生成的，最终的C-O键很可能是通过高氧化态Csp3-Pd(O2CR)配合物的还原消除形成的，该过程可能涉及SN2型亲核攻击路径。
• Synthesis of Enantiopure Fluorohydrins Using Alcohol Dehydrogenases at High Substrate Concentrations
  作者：Wioleta Borzęcka、Iván Lavandera、Vicente Gotor

  DOI：10.1021/jo400962c

  日期：2013.7.19

  The use of purified and overexpressed alcohol dehydrogenases to synthesize enantiopure fluorinated alcohols is shown. When the bioreductions were performed with ADH-A from Rhodococcus ruber overexpressed in E. coli, no external cofactor was necessary to obtain the enantiopure (R)-derivatives. Employing Lactobacillus brevis ADH, it was possible to achieve the synthesis of enantiopure (S)-fluorohydrins at a 0.5 M substrate concentration. Furthermore, due to the activated character of these substrates, a huge excess of the hydrogen donor was not necessary.
• Asymmetric reduction using (R)-MeCBS and determination of absolute configuration of para-substituted 2-fluoroarylethanols
  作者：Erik Fuglseth、Eirik Sundby、Per Bruheim、Bård Helge Hoff

  DOI：10.1016/j.tetasy.2008.07.019

  日期：2008.8

  The asymmetric reduction of eight alpha-fluoroacetophenones has been investigated using (R)-MeCBS as a catalyst in various media. Based on a solvent screen, 1,2-dimethoxyethane, diethyl ether and dichloromethane were used in reductions of the alpha-fluoroacetophenones. The enantiomeric excess of the products depended oil the solvent and the electronic character of the aromatic substituents. Higher enantioselectivity and less solvent dependency were observed in the reduction of substrates bearing electron donating substituents, whereas the opposite was the case for reduction of the substrates with electron withdrawing substituents. The (R)-2-fluoro-1-arylethanols were obtained with enantiomeric excesses in the range of 91-99% using 1,2-dimethoxyethane as a solvent. Six of the alcohols produced are new chemical entities. The absolute configurations of the (R)-2-fluoro-1-arylethanols were determined by circular dichroism using the exciton chirality method of tile (S)-benzoate esters of the alcohols. The (S)-benzoate esters were obtained by lipase-catalysed resolution using Novozym 435. (C) 2008 Elsevier Ltd. All Fights reserved.