1-oxohexan-2-yl 4-nitrobenzoate | 1262801-39-7

• 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: 1-oxohexan-2-yl 4-nitrobenzoate
• 英文别名: 1-Oxohexan-2-yl 4-nitrobenzoate
• CAS: 1262801-39-7
• 化学式: C₁₃H₁₅NO₅
• 分子量: 265.266
• InChiKey: LAVVPVIAJRGIBN-UHFFFAOYSA-N

物化性质

• 沸点：
  419.1±30.0 °C(Predicted)
• 密度：
  1.209±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3
• 重原子数：
  19
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.38
• 拓扑面积：
  89.2
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  1-oxohexan-2-yl 4-nitrobenzoate 、 (E)-4,4,4-trifluoro-1-phenyl-2-buten-1-one 在 (5aR,10bS)-5a,10b-dihydro-2-(2,4,6-trimethylphenyl)-4H,6H-indeno[2,1-b]-1,2,4-triazolo[4,3-d]-1,4-oxazinium chloride 、 三乙胺 作用下， 以 四氢呋喃 为溶剂， 反应 14.0h， 以63%的产率得到(3S,4S)-3-butyl-6-phenyl-4-(trifluoromethyl)-3,4-dihydro-2H-pyran-2-one
  参考文献：
  名称：

  Stereospecific Asymmetric N-Heterocyclic Carbene (NHC)-Catalyzed Redox Synthesis of Trifluoromethyl Dihydropyranones and Mechanistic Insights

  摘要：

  N-Heterocyclic carbene (NHC)-catalyzed redox asymmetric hetero-Diels-Alder reactions of alpha-aroyloxyaldehydes with beta-trifluoromethyl enones generates synthetically useful dihydropyranones containing a stereogenic trifluoromethyl substituent in good yields (up to 81%) and excellent diastereoselectivity and enantioselectivity (up to >95:5 dr and >99% ee). The process is stereospecific, with use of either (E)- or (Z)-beta-trifluoromethyl enones forming syn- or anti-dihydropyranone products, respectively. Mechanistic studies through in situ kinetic analysis of the reaction reveal key differences in reactivity between chiral NHC precursor 1 and an achiral NHC precursor.

  DOI：

  10.1021/jo401433q
• 作为产物：
  描述：

  hept-1-en-3-yl p-nitrobenzoate 在 臭氧 、 二甲基硫 作用下， 以 二氯甲烷 为溶剂， 以80%的产率得到1-oxohexan-2-yl 4-nitrobenzoate
  参考文献：
  名称：

  α-Aroyloxyaldehydes: scope and limitations as alternatives to α-haloaldehydes for NHC-catalysed redox transformations

  摘要：

  α-芳氧醛是一种容易制备且在桌面上稳定的合成中间体。它们在NHC促进的氧化还原酯化反应以及[4+2]环加成反应中作为α-卤醛的替代物的能力得到了描述。

  DOI：

  10.1039/c0cc02456b

文献信息

• Enantioselective NHC‐Catalyzed Redox [2+2] Cycloadditions with Perfluoroketones: A Route to Fluorinated Oxetanes
  作者：Alyn T. Davies、Alexandra M. Z. Slawin、Andrew D. Smith

  DOI：10.1002/chem.201504256

  日期：2015.12.21

  carbene (NHC) catalyzed redox formal [2+2] cycloaddition between α‐aroyloxyaldehydes and perfluoroketones, followed by ring‐opening in situ delivers a variety of perfluorinated β‐hydroxycarbonyl compounds in good yield, and excellent diastereo‐ and enantioselectivity. Through a reductive work‐up and subsequent cyclization, this protocol offers access to highly substituted fluorinated oxetanes in two

  N-杂环卡宾（NHC）催化α-芳酰氧基醛与全氟酮之间的氧化还原形式[2 + 2]环加成反应，然后原位开环提供各种全氟β-羟基羰基化合物，收率高，非对映和对映选择性优异。通过还原后处理和随后的环化，该方案可分两步以高ee值获得高度取代的氟化氧杂环丁烷。
• Asymmetric NHC-Catalyzed Redox α-Amination of α-Aroyloxyaldehydes
  作者：James E. Taylor、David S. B. Daniels、Andrew D. Smith

  DOI：10.1021/ol402955f

  日期：2013.12.6

  (NHC)-catalyzed redox reaction of α-aroyloxyaldehydes with N-aryl-N-aroyldiazenes to form α-hydrazino esters with high enantioselectivity (up to 99% ee) is reported. The hydrazide products are readily converted into enantioenriched N-aryl amino esters through samarium(II) iodide mediated N–N bond cleavage.

  报道了通过 N-杂环卡宾 (NHC) 催化的 α-芳酰氧基醛与N-芳基-N-芳酰基二氮烯的氧化还原反应形成具有高对映选择性（高达 99% ee）的 α-肼基酯的不对称 α-胺化。通过碘化钐（II）介导的 N-N 键断裂，酰肼产物很容易转化为对映体富集的N-芳基氨基酯。
• Enantioselective N-heterocyclic carbene catalyzed formal [3+2] cycloaddition using α-aroyloxyaldehydes and oxaziridines
  作者：Ryan W.F. Kerr、Mark D. Greenhalgh、Alexandra M.Z. Slawin、Polly L. Arnold、Andrew D. Smith

  DOI：10.1016/j.tetasy.2016.10.012

  日期：2017.1

  An enantioselective N-heterocyclic carbene catalysed formal [3+2] cycloaddition has been developed for the synthesis of oxazolindin-4-one products. The reaction of oxaziridines and alpha-aroyloxyaldehydes under N-heterocyclic carbene catalysis provides the formal cycloaddition products with excellent control of the diastereo- and enantioselectivity (12 examples, up to >95:5 dr, >99:1 er). A matched-mismatched effect between the enantiomer of the catalyst and oxaziridine was identified, and preliminary mechanistic studies have allowed the proposal of a model to explain these observations. (C) 2016 Published by Elsevier Ltd.
• Asymmetric Synthesis of Tri- and Tetrasubstituted Trifluoromethyl Dihydropyranones from α-Aroyloxyaldehydes via NHC Redox Catalysis
  作者：Alyn T. Davies、Philip M. Pickett、Alexandra M. Z. Slawin、Andrew D. Smith

  DOI：10.1021/cs500667g

  日期：2014.8.1

  The asymmetric synthesis of tri- and tetrasubstituted trifluoromethyl dihydropyranones via an NHC-catalyzed redox process, introducing methyl, benzyl, and aryl substituents to the C(5) position, is presented. Their substrate-controlled derivatization into delta-lactones and cyclic hemiacetals containing stereogenic trifluoromethyl groups is also described.
• Enantioselective NHC-catalysed redox [4+2]-hetero-Diels-Alder reactions using α-aroyloxyaldehydes and unsaturated ketoesters
  作者：James E. Taylor、Alyn T. Davies、James J. Douglas、Gwydion Churchill、Andrew D. Smith

  DOI：10.1016/j.tetasy.2017.01.002

  日期：2017.2

  N-Heterocyclic carbene (NHC)-catalysed redox [4+2]-hetero-Diels-Alder reactions of alpha-aroyloxyaldehydes with either beta,gamma-unsaturated alpha-ketoesters or alpha,beta-unsaturated gamma-ketoesters generates substituted syn-dihydropyranones in good yield with excellent enantioselectivity (up to >99:1 er). The product diastereoselectivity is markedly dependent upon the nature of the unsaturated enone substituent. The presence of either electron-neutral or electron-rich aryl substituents gives excellent diastereoselectivity (up to >99:5 dr), while electron-deficient aryl substituents give reduced diastereoselectivity. In these cases, the syn-dihydropyranone products are more susceptible to base-promoted epimerisation at the C(4)-position under the reaction conditions, accounting for the lower diastereoselectivity obtained. (C) 2017 Published by Elsevier Ltd.