C-(4-methoxyphenyl)-N-methyl nitrone | 203731-09-3

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯酚醚
• 英文名称: C-(4-methoxyphenyl)-N-methyl nitrone
• 英文别名: (Z)-1-(4-methoxyphenyl)-N-methylmethanimine oxide；1-(4-methoxyphenyl)-N-methylmethanimine oxide
• CAS: 203731-09-3
• 化学式: C₉H₁₁NO₂
• 分子量: 165.192
• InChiKey: HVBZJCSNXVMPIH-YFHOEESVSA-N

物化性质

• 沸点：
  293.1±42.0 °C(Predicted)
• 密度：
  1.077±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  0.3
• 重原子数：
  12
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.22
• 拓扑面积：
  38
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  C-(4-methoxyphenyl)-N-methyl nitrone 在 硫酸 作用下， 反应 240.25h， 生成 4-甲氧基肉桂醛
  参考文献：
  名称：

  Ring-opening of isoxazolidine system: Homologation of 3-aryl into 3-styryl nitrones via intermediate 5-hydroxy-isoxazolidines.

  摘要：

  High yield conversion of 3-aryl-5-ethoxy-isoxazolidines into 3-styryl nitrones has been achieved by 1,5 h refluxing in aq. H2SO4 or catalytic p-toluensulfonic acid/ethanol media. The rearrangement pathway is interpretable on the basis of the ring-opening process of intermediate 5-hydroxy-isoxazolidines. Formation of a masked 5-OH function has been also developed by basic or acid treatment of 5-acetoxy-isoxazolidines.

  DOI：

  10.1016/s0040-4020(01)88315-0
• 作为产物：
  描述：

  N-甲基羟胺 、 4-甲氧基苯甲醛 在 sodium acetate 作用下， 反应 0.06h， 以72%的产率得到C-(4-methoxyphenyl)-N-methyl nitrone
  参考文献：
  名称：

  Exploiting microwave-assisted neat procedures: synthesis of N-aryl and N-alkylnitrones and their cycloaddition en route for isoxazolidines

  摘要：

  Microwave irradiation allows increasing the speed of several reactions and also offers the possibility of eliminating poisoning organic solvents. In this work we report the microwave-assisted neat synthesis of alpha-phenyl-tert-butylnitrone (PBN) and other alkyl and aryl nitrones and also the rapid synthesis of isoxazolidines resulting from 1,3-dipolar cycloaddition of nitrones to ethyl trans-crotonate. (c) 2008 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2008.08.101

文献信息

• Asymmetric “Acetylenic” [3+2] Cycloaddition of Nitrones Catalyzed by Cationic Chiral Pd^II Lewis Acid
  作者：Kazuya Honda、Koichi Mikami

  DOI：10.1002/asia.201801016

  日期：2018.10.4

  Highly enantioselective [3+2] cycloaddition of ynones and nitrones has been developed. Very bulky ligand, DTBM‐SEGPHOS, was used for an effective asymmetric induction over distal reaction centers on the linear ynone dipolarophile and for prevention of PdII catalyst deactivation by coordination of the nitrones. The reaction has wide scope of substrates in both ynones and nitrones.

  已经开发出对映体和硝酮的高度对映选择性的[3 + 2]环加成反应。很大体积的配体DTBM-SEGPHOS用于在线性乙炔双极性亲和体的远端反应中心进行有效的不对称诱导，并通过硝酮的配位防止Pd II催化剂失活。该反应在炔酮和硝酮中具有广泛的底物范围。
• (3 + 3) Cycloaddition of Oxyallyl Cations with Nitrones: Diastereoselective Access to 1,2-Oxazinanes
  作者：Marie Cordier、Alexis Archambeau

  DOI：10.1021/acs.orglett.8b00617

  日期：2018.4.20

  Oxyallyl cations are prepared in situ from readily available α-tosyloxy ketones and act as transient electrophilic partners in (3 + 3) cycloaddition with nitrones. Under mild conditions, this method provides a chemoselective and diastereoselective route to polysubstituted 1,2-oxazinanes. A stepwise process is proposed to rationalize the diastereoselectivity of this transformation.

  由容易获得的α-甲苯磺酰氧基原位制备羟基烯丙基阳离子，并在与硝酮的（3 + 3）环加成中充当瞬态亲电子伙伴。在温和的条件下，该方法为多取代的1,2-恶嗪酮提供了化学选择性和非对映选择性的途径。提出了逐步处理以合理化此变换的非对映选择性。
• Electronic effects in 1,3-dipolar cycloaddition reactions of N-alkyl and N-benzyl nitrones with dipolarophiles
  作者：Andrei Bădoiu、E. Peter Kündig

  DOI：10.1039/c1ob06144e

  日期：——

  1,3-Dipolar cycloadditions afforded fast access to isoxazolidines bearing N-alkyl or N-benzyl substituents. The electronic properties of the substituents in the nitrones define the activity of the dipoles and modulate diastereoselectivity in the non-catalyzed reactions. Using a chiral one-point binding ruthenium Lewis acid catalyst, products were obtained in good yields and with excellent regio-, diastereo-

  1，3-偶极环加成可快速接近带有N-烷基或N-苄基取代基的异恶唑烷。硝酮中取代基的电子性质定义了偶极子的活性，并调节了非催化反应中的非对映选择性。使用手性单点结合钌路易斯酸催化剂，可以以良好的收率和优异的区域，非对映和对映选择性获得产物。
• Cycloaddition of nitrones and α,β-unsaturated sugar lactones
  作者：Irma Panfil、Marek Chmielewski

  DOI：10.1016/s0040-4020(01)82368-1

  日期：1985.1

  It was found that 1,3-cycloaddition of nitrones 1–3 to α,β-unsaturated sugar carbonyl compounds 4–8 proceeds regiospecifically to give mixtures of stereoisomers. Nitrones 1–3 entered compounds 4–8 in trans-relation to the existing ring substituent.

  据发现，硝酮的1,3-环加成1 - 3至α，β不饱和羰基的糖化合物4 - 8区域专一性进行，得到立体异构体的混合物。硝酮1 - 3个输入的化合物4 - 8在反式-relation现有环取代基。
• A new version of the reverse-Cope elimination initiated by the nucleophilic addition of allylamines to nitrones: a synthesis of vicinal diamines
  作者：Michael B. Gravestock、David W. Knight、K. M. Abdul Malik、Steven R. Thornton

  DOI：10.1039/b003959o

  日期：——

  are successful, giving the trans-oxadiazinanes 24, 33 and the stereoisomers 38 and 39 from linalylamine 37, but only when the terminus of the allylamine is unsubstituted are the reactions efficient. A range of N-alkylallylamines 43, 45, 47 and 49, however, react smoothly with nitrone 8, as competing imine formation is precluded. Various mechanistic aspects are discussed, along with the effects of aryl

  尝试在与被保护的烯丙胺6进行对映选择性[1,3]偶极环加成反应中使用糖衍生的硝酮1只是部分成功，得到了预期加合物的混合物7。但是，硝酮1和未保护的烯丙胺11之间的反应遵循不同的途径，涉及通过胺，反向应对 环化和Meisenheimer重排导致1,2,5- oxadiazinanes 12和13。与类似的反应苯甲醛衍生的硝酮8是成功的，赋予反-oxadiazinanes 24，33和立体异构体38和39从芳基胺 如图37所示，但是只有当烯丙基胺的末端未被取代时，反应才有效。的范围Ñ -alkylallylamines 43，45，47和49，但是，与硝酮顺利反应8，如竞争性亚胺排除形成。讨论了各种机械方面，以及以下方面的影响：芳基在N-苄基烯丙胺57中和在硝酮8的4-位（59）处的取代基，没有发现可以提高总反应速率的取代基。最初的恶二嗪酮可用作氨基羟胺69和邻位的前体二胺衍生物70。