N-methoxy-N-methyl-2-(phenylethynyl)benzamide | 294190-46-8

• 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: N-methoxy-N-methyl-2-(phenylethynyl)benzamide
• 英文别名: N-methoxy-N-methyl-2-(2-phenylethynyl)benzamide
• CAS: 294190-46-8
• 化学式: C₁₇H₁₅NO₂
• 分子量: 265.312
• InChiKey: DSWIMLJRXFOMBA-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  20
• 可旋转键数：
  4
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.12
• 拓扑面积：
  29.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  N-methoxy-N-methyl-2-(phenylethynyl)benzamide 在 N-氯代丁二酰亚胺 、 copper dichloride 作用下， 以 乙腈 为溶剂， 反应 0.5h， 以90%的产率得到(E)-3-[chloro(phenyl)methylene]isobenzofuran-1(3H)-one
  参考文献：
  名称：

  Copper(II)Chloride-Mediated Cyclization Reaction ofN-Alkoxy-ortho-alkynylbenzamides

  摘要：

  A regioselective intramolecular cyclization/halogenation reaction of N-alkoxy-o-alkynylbenzamides with CuCl2/NCS was developed. The corresponding 3-(chloromethylene)isobenzofuran-1-ones were exclusively obtained via 5-exo-dig cyclization in moderate to excellent yields within 0.5-1 h. This approach has been successfully used to synthesize a biaryl compound by the Suzuki-Miyaura reaction.

  DOI：

  10.1021/ol1029035
• 作为产物：
  描述：

  2-碘苯甲酸 在 copper(l) iodide 、 四(三苯基膦)钯 、 草酰氯 、 正丁胺 、 N,N-二甲基甲酰胺 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 16.0h， 生成 N-methoxy-N-methyl-2-(phenylethynyl)benzamide
  参考文献：
  名称：

  Copper(II)Chloride-Mediated Cyclization Reaction ofN-Alkoxy-ortho-alkynylbenzamides

  摘要：

  A regioselective intramolecular cyclization/halogenation reaction of N-alkoxy-o-alkynylbenzamides with CuCl2/NCS was developed. The corresponding 3-(chloromethylene)isobenzofuran-1-ones were exclusively obtained via 5-exo-dig cyclization in moderate to excellent yields within 0.5-1 h. This approach has been successfully used to synthesize a biaryl compound by the Suzuki-Miyaura reaction.

  DOI：

  10.1021/ol1029035

文献信息

• Synthesis of Difluoromethyl Ketones from Weinreb Amides, and Tandem Addition/Cyclization of <i>o</i> -Alkynylaryl Weinreb Amides
  作者：Jongkonporn Phetcharawetch、Nolan M. Betterley、Darunee Soorukram、Manat Pohmakotr、Vichai Reutrakul、Chutima Kuhakarn

  DOI：10.1002/ejoc.201701322

  日期：2017.12.15

  [Difluoro(phenylsulfanyl)methyl]trimethylsilane (PhSCF2SiMe3) underwent a fluoride-induced nucleophilic addition to the carbonyl group of Weinreb amides to provide the corresponding difluoro(phenylsulfanyl)methyl ketones. These were converted into difluoromethyl ketones through selective reductive cleavage of the phenylsulfanyl group. The reaction of o-alkynyl Weinreb amides derived from benzoic acid derivatives resulted

  [二氟（苯硫基）甲基]三甲基硅烷（PhSCF2SiMe3）与Weinreb酰胺的羰基发生氟化物诱导的亲核加成反应，得到相应的二氟（苯硫基）甲基酮。它们通过苯硫基的选择性还原裂解转化为二氟甲基酮。衍生自苯甲酸衍生物的邻炔基 Weinreb 酰胺的反应导致通过 5-exo-dig 环化形成环化产物。
• Oxyanion-Accelerated C²−C⁶ Cyclization of Benzannulated Enyne-allenes
  作者：Steven R. Brunette、Mark A. Lipton

  DOI：10.1021/jo991876v

  日期：2000.8.1

  The cyclization of oxyanion-substituted, benzannulated enyne-allenes was found to proceed rapidly and efficiently at room temperature, producing substituted indanones and fluorenones through a C2-C6 cyclization pathway. These reactions bear close resemblance to thermal C2-C6 cyclizations of enyne-allenes previously reported by Schmittel and others, though the oxyanion-substituted cases cyclize far

  发现在室温下，氧阴离子取代的苯环烯化的烯炔-丙烯的环化快速有效地进行，通过C2-C6环化途径产生取代的茚满酮和芴酮。这些反应与Schmittel等人先前报道的烯炔-丙烯的热C2-C6环化非常相似，尽管氧阴离子取代的情况下环化速度更快，并且与（Z的C2-C7（Myers）环化形成鲜明对比）-1,2-，4-庚三烯-6-炔，母体烯炔-丙二烯。尽管反应的电子效应未知，但发现反应速率对炔烃和丙二烯取代基的大小敏感。氧阴离子取代基赋予的加速作用与拟议的C2-C6环化的双自由基过渡态的电子稳定作用是一致的，但是现有证据不允许在协同机理和逐步机理之间进行区分。为了进一步阐明这种机理并扩大这些转变的范围，正在进行研究。
• Organophotocatalytic N–O Bond Cleavage of Weinreb Amides: Mechanism-Guided Evolution of a PET to ConPET Platform
  作者：Julia Soika、Calum McLaughlin、Tomáš Neveselý、Constantin G. Daniliuc、John. J. Molloy、Ryan Gilmour

  DOI：10.1021/acscatal.2c02991

  日期：2022.8.19

  A mild, organophotocatalytic N–O bond cleavage of Weinreb amides is disclosed, thereby expanding the chemistry of this venerable motif beyond acylation. This redox neutral process begins to reconcile the ubiquity of N–O bonds in contemporary synthesis with the disproportionately harsh, stoichiometric conditions that are often required for bond cleavage. The strategy is compatible with the parent alkyl

  Weinreb 酰胺的温和、有机光催化 N-O 键裂解，从而将这一古老基序的化学扩展到酰化之外。这种氧化还原中性过程开始调和当代合成中普遍存在的 N-O 键与键断裂通常所需的不成比例的苛刻化学计量条件。该策略与母体烷基衍生物（N-OMe、N-OAlkyl）兼容，从而补充了定制的O- 需要 N-OAr 基团的取代基方法（Ar = 缺电子）。公开了广泛的无环和环状衍生物（>40 个实例，高达 95%），并且该方法的合成效用在一系列应用中得到证明。在环状 Weinreb 酰胺衍生物的情况下，该平台能够在一次转化中生成不同链长的两亲酰胺醛。受 Emil Fischer 1908 年使用钠汞齐合成氨基乙醛的开创性启发，这种方法提供了一种更温和的途径来获得这类重要的材料。机械引导的反应发展证明了光诱导电子转移 (PET) 机制的参与，这已进一步发展为连续光诱导电子转移 (ConPET) 歧管：
• Palladium-Catalyzed Synthesis of Isoquinolinones via Sequential Cyclization and N-O Bond Cleavage of N-Methoxy-o-alkynylbenzamides
  作者：Masafumi Ueda、Okiko Miyata、Manita Jithunsa、Naoki Aoi、Shoichi Sugita、Tetsuya Miyoshi

  DOI：10.1055/s-0032-1318159

  日期：——

  A palladium-catalyzed controlled 6-endo-dig cyclization process has been developed for the chemoselective synthesis of isoquinolin-1-ones from N-alkoxy-o-alkynylbenzamides. The mechanism and scope of the reaction have also been investigated. Deuterium-labeling studies were used to confirm the intramolecular 1,5-hydrogen shift as a key step in the transformation.
• Copper(II)Chloride-Mediated Cyclization Reaction of<i>N</i>-Alkoxy-<i>ortho</i>-alkynylbenzamides
  作者：Manita Jithunsa、Masafumi Ueda、Okiko Miyata

  DOI：10.1021/ol1029035

  日期：2011.2.4

  A regioselective intramolecular cyclization/halogenation reaction of N-alkoxy-o-alkynylbenzamides with CuCl2/NCS was developed. The corresponding 3-(chloromethylene)isobenzofuran-1-ones were exclusively obtained via 5-exo-dig cyclization in moderate to excellent yields within 0.5-1 h. This approach has been successfully used to synthesize a biaryl compound by the Suzuki-Miyaura reaction.