3,4,6,6-tetramethyl-5,6-dihydro-4H-[1,2]oxazine 2-oxide | 929878-90-0

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 氧杂环化合物
• 英文名称: 3,4,6,6-tetramethyl-5,6-dihydro-4H-[1,2]oxazine 2-oxide
• 英文别名: 3,4,6,6-tetramethyl-5,6-dihydro-4H-1,2-oxazine 2-oxide
• CAS: 929878-90-0
• 化学式: C₈H₁₅NO₂
• 分子量: 157.213
• InChiKey: YLKLAQFABCOMII-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.71
• 重原子数：
  11.0
• 可旋转键数：
  0.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  35.3
• 氢给体数：
  0.0
• 氢受体数：
  2.0

反应信息

• 作为反应物：
  描述：

  3,4,6,6-tetramethyl-5,6-dihydro-4H-[1,2]oxazine 2-oxide 在 氢气 、 cesium fluoride 作用下， 以 甲醇 、 水 、 乙腈 为溶剂， 20.0 ℃ 、3.04 MPa 条件下， 反应 2.0h， 生成 tert-butyl ((2S*,3R*)-5-hydroxy-2-(2-hydroxyphenyl)-3,5-dimethylhexan-2-yl)carbamate
  参考文献：
  名称：

  硝基-芳烃环加成作为立体化学复杂稠合苯并异恶唑啉和氨基醇的简明途径

  摘要：

  环状硝酸酯（异恶唑啉N-氧化物和5,6-二氢-4 H -1,2-恶嗪N）的反应-氧化物）与 Kobayashi 的芳炔前体通过 [3 + 2]-环加成反应得到三环苯稠合亚硝基缩醛。在大多数情况下，该过程具有区域选择性和立体选择性，并产生具有多达四个连续立体中心的目标环加合物。通过 N-O 键的催化氢解，这些亚硝基缩醛被证明是有价值的多取代氨基二醇的方便前体。此外，质子酸的作用通过异质 N-O 键断裂和贝克曼型反应导致环状亚硝基缩醛部分异常断裂。使用这种酸介导的反应，完成了迄今为止未知的六氢苯并[4,5]异恶唑并[2,3- a ]氮杂支架的合成。

  DOI：

  10.1039/d3ob00235g
• 作为产物：
  描述：

  2-nitro-but-2-ene 、 异丁烯 在 四氯化锡 作用下， 以 二氯甲烷 为溶剂， 生成 3,4,6,6-tetramethyl-5,6-dihydro-4H-[1,2]oxazine 2-oxide
  参考文献：
  名称：

  Synthesis and characterization of novel 1,2-oxazine-based small molecules that targets acetylcholinesterase

  摘要：

  Thirteen 2-oxazine-based small molecules were synthesized targeting 5-lipoxygenase (LOX), and acetylcholinesterase (AChE). The test revealed that the newly synthesized compounds had potent inhibition towards both 5-LOX and AChE in lower micro molar concentration. Among the tested compounds, the most active compound, 2-[(2-acetyl-6,6-dimethy1-4-phenyl-5,6-dihydro-2H-1,2-oxazin-3-yl)methyl]-1H-isoindole-1,3(2H)-dione (2a) showed inhibitory activity towards 5-LOX and AChE with an IC50 values of 1.88, and 2.5 mu M, respectively. Further, the in silico molecular docking studies revealed that the compound 2a bound to the catalytic domain of AChE strongly with a highest CDOCKER score of -1.18 kcal/mol when compared to other compounds of the same series. Additionally, 2a showed a good lipophilicity (logP = 2.66), suggesting a potential ability to penetrate the blood-brain-barrier. These initial pharmacological data revealed that the compound 2a could serve as a drug-seed in developing anti-Alzheimer's agents. (C) 2014 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.bmcl.2014.05.040

文献信息

• 3-Halomethylated cyclic nitronates: synthesis and nucleophilic substitution
  作者：Andrey A. Mikhaylov、Alexander D. Dilman、Marina I. Struchkova、Yulia A. Khomutova、Alexander A. Korlyukov、Sema L. Ioffe、Vladimir A. Tartakovsky

  DOI：10.1016/j.tet.2011.04.078

  日期：2011.6

  group attached to the C-3 atom of five- and six-membered cyclic nitronates (isoxazoline N-oxides and oxazine N-oxides, respectively) has been studied. The process involves silylation of starting 3-methyl-substituted cyclic nitronates followed by halogenation of the resulting N-(silyloxy)enamines. While five- and six-membered cyclic enamines behave similarly toward elemental bromine and iodine, their

  已经研究了将卤素原子引入与五元和六元环状硝酸盐（分别为异恶唑啉N-氧化物和恶嗪N-氧化物）的C-3原子相连的甲基中的方法。该方法包括将起始的3-甲基取代的环状硝酸酯甲硅烷基化，然后将所得的N-（甲硅烷氧基）烯胺卤化。尽管五元和六元环状烯胺对元素溴和碘的行为相似，但它们与NBS的反应产生了不同的产物，这些产物通过立体电子效应得以合理化。将获得的卤代硝酸盐与各种亲核试剂偶联，得到在C-3位官能化的新的硝酸盐。
• New Rearrangement of Conjugated Cyclic Ene Nitroso O-Trimethylsilyl Acetals: Convenient Synthesis of Dihydro-2H-pyran-3-one and Dihydrofuran-3-one Oximes
  作者：Andrey Tabolin、Sema Ioffe、Yulia Khomutova、Yulia Nelyubina、Vladimir Tartakovsky

  DOI：10.1055/s-0030-1260108

  日期：2011.8

  The nucleophile-induced rearrangement of cyclic N-alkoxy-N-(silyloxy)enamines was investigated. As a result, a new strategy for the synthesis of β-pyranone and β-furanone derivatives from nitro compounds is suggested. nitroso acetals - rearrangement - nitrogen heterocycles - 1,2-oxazines - aliphatic nitro compounds

  研究了亲核试剂诱导的环状N-烷氧基-N-（甲硅烷氧基）烯胺的重排。结果，提出了一种由硝基化合物合成β-吡喃酮和β-呋喃酮衍生物的新策略。 亚硝基缩醛-重排-氮杂环-1,2-恶嗪-脂肪族硝基化合物
• A General Metal-Assisted Synthesis of α-Halo Oxime Ethers from Nitronates and Nitro Compounds
  作者：Alexey Yu. Sukhorukov、Maria A. Kapatsyna、Tammy Lim Ting Yi、Hyeong Ryool Park、Yana A. Naumovich、Petr A. Zhmurov、Yulia A. Khomutova、Sema L. Ioffe、Vladimir A. Tartakovsky

  DOI：10.1002/ejoc.201403083

  日期：2014.12

  α-halo oxime ethers from readily accessible nitronates and nitro compounds via bis(oxy)enamines is reported. A key step of the strategy involves the unprecedented reaction of bis(oxy)enamines with a metal (Co, Zn, Mg, Mn) halide that acts as both a promoter and halide (Br, I, Cl) source. A variety of cyclic and acyclic ethers of α-halo oximes, including previously unavailable trimethylsilyl ethers of α-iodo

  报道了一种通过双（氧）烯胺从容易获得的硝基化合物和硝基化合物合成 α-卤代肟醚的方法。该策略的一个关键步骤涉及双（氧）烯胺与金属（Co、Zn、Mg、Mn）卤化物的前所未有的反应，该卤化物既作为促进剂又作为卤化物（Br、I、Cl）源。各种 α-卤代肟的环状和非环状醚，包括以前无法获得的 α-碘肟的三甲基甲硅烷基醚，已经以良好到高的产率合成。
• Addition of HO-Acids to <i>N</i> ,<i>N</i> -Bis(oxy)enamines: Mechanism, Scope and Application to the Synthesis of Pharmaceuticals
  作者：Yana A. Naumovich、Ivan S. Golovanov、Alexey Yu. Sukhorukov、Sema L. Ioffe

  DOI：10.1002/ejoc.201701266

  日期：2017.11.9

  calculations revealed that solvent affects the reaction pathway. In basic solvents (DMF, NMP, DMSO), N,N-bis(oxy)enamines were converted into nitrosoalkenes by a Lewis base promoted process followed by oxy-Michael addition of the HO-acid. In non-polar solvents (toluene, CH2Cl2), the reaction occurs by an acid-promoted SN′ substitution of the N-oxy-group via a highly reactive N-vinyl-N-alkoxynitrenium species.

  已发现将 HO-酸添加到 N,N-双（氧）烯胺中活化的 π 键的区域选择性极大地取决于溶剂。机理研究和量子化学计算表明，溶剂会影响反应途径。在碱性溶剂（DMF、NMP、DMSO）中，N,N-双（氧）烯胺通过路易斯碱促进的过程转化为亚硝基烯烃，然后是 H2O 酸的氧迈克尔加成。在非极性溶剂（甲苯、CH2Cl2）中，反应通过酸促进的 N-氧基团的 SN' 取代通过高反应性的 N-乙烯基-N-烷氧基硝基物质发生。基于这些研究，开发了使用现成的 N，N-双（氧）烯胺对各种 HO-酸（羧酸、酚类、异羟肟酸、磷酸和磺酸）进行肟基烷基化的通用和有效方案。这些方法被证明适用于带有酸性 OH 基团（如甾体激素、胆汁酸、受保护的氨基酸和肽）和配体 (BINOL) 的天然分子的后修饰。所得α-羟基肟被证明是有价值的1,2-氨基醇或1,2-羟基氨基醇衍生物的有用前体，包括抗心律失常药物美西律和有效的基质金属蛋白酶抑制剂。
• Tandem Deoxygenation/Halogenation of <i>N</i> -Oxides Under Acylation Conditions: Scope and In Situ IR Spectroscopic Study
  作者：Roman S. Malykhin、Ivan S. Golovanov、Sema L. Ioffe、Alexey Yu. Sukhorukov

  DOI：10.1002/ejoc.201900131

  日期：2019.7.14

  Unusual acylation of 1,2‐oxazine N‐oxides with acyl bromides produces 3‐bromomethyl‐substituted 2H‐1,2‐oxazines via the formation of molecular bromine as intermediate. The developed process was successfully exploited in the stereoselective synthesis of pharmaceutically relevant molecules.

  1,2-恶嗪N-氧化物与酰基溴的不寻常酰化反应会通过形成分子溴作为中间体来生成3-溴甲基-取代的2 H - 1,2-恶嗪。所开发的方法已成功地用于药物相关分子的立体选择性合成中。