4-bromochroman

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并吡喃
• 英文名称: 4-bromochroman
• 英文别名: 4-bromochromane；4-bromo-3,4-dihydro-2H-chromene
• 化学式: C₉H₉BrO
• 分子量: 213.074
• InChiKey: AWSXVTPKXAZCLF-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.6
• 重原子数：
  11
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  9.2
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  4-bromochroman 在 sodium azide 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 2.0h， 以80%的产率得到4-azidochroman
  参考文献：
  名称：

  Synthesis and evaluation of dimeric 1,2,3,4-Tetrahydro-naphthalenylamine and Indan-1-ylamine derivatives with mast cell-stabilising and anti-allergic activity

  摘要：

  In a continuation of our studies into 4-Amino-3,4-dihydro-2H-naphthalen-1-ones as novel modulators of allergic and inflammatory phenomena, we have extended our work to include dimeric analogues. Of these derivatives, the most promising activity was seen with tertiary amine 58a, which exhibited potent mast cell-stabilising activity in vitro against a variety of stimuli and also in vivo against passive cutaneous anaphylaxis. (C) 2009 Elsevier Masson SAS. All rights reserved.

  DOI：

  10.1016/j.ejmech.2009.09.020
• 作为产物：
  描述：

  2H-色烯 在 乙醚 、 氢溴酸 作用下， 生成 4-bromochroman
  参考文献：
  名称：

  Maitte, Annales de Chimie (Cachan, France), 1954, vol. <12> 9, p. 431,363

  摘要：

  DOI：

文献信息

• Transition-Metal-Free Stereospecific Cross-Coupling with Alkenylboronic Acids as Nucleophiles
  作者：Chengxi Li、Yuanyuan Zhang、Qi Sun、Tongnian Gu、Henian Peng、Wenjun Tang

  DOI：10.1021/jacs.6b06285

  日期：2016.8.31

  We herein report a transition-metal-free cross-coupling between secondary alkyl halides/mesylates and aryl/alkenylboronic acid, providing expedited access to a series of nonchiral/chiral coupling products in moderate to good yields. Stereospecific SN2-type coupling is developed for the first time with alkenylboronic acids as pure nucleophiles, offering an attractive alternative to the stereospecific

  我们在此报告了仲烷基卤化物/甲磺酸盐和芳基/烯基硼酸之间的无过渡金属交叉偶联，以中等至良好的产率快速获得一系列非手性/手性偶联产物。首次使用烯基硼酸作为纯亲核试剂开发了立体特异性 SN2 型耦合，为立体特异性过渡金属催化的 C(sp(2))-C(sp(3)) 交叉耦合提供了一种有吸引力的替代方案。
• Palladium-Catalyzed Cross-Coupling Reaction of Secondary Benzylic Bromides with Grignard Reagents
  作者：Ana López-Pérez、Javier Adrio、Juan C. Carretero

  DOI：10.1021/ol902335c

  日期：2009.12.3

  A mild palladium-catalyzed Kumada−Corriu reaction of secondary benzylic bromides with aryl and alkenyl Grignard reagents has been developed. In the presence of the Xantphos ligand, the undesired β-elimination pathway is minimized, affording the corresponding cross-coupling products in acceptable to good yields. The reaction proceeds with inversion of the configuration.

  已开发出中等温和的钯催化仲苄基溴化物与芳基和烯基格利雅试剂的Kumada-Corriu反应。在Xantphos配体的存在下，不希望有的β-消除途径被最小化，以可接受的产率提供了相应的交叉偶联产物。反应随着构型的反转而进行。
• Rhodium-Catalyzed Synthesis of 2,3-Disubstituted Indoles from β,β-Disubstituted Stryryl Azides
  作者：Ke Sun、Sheng Liu、Patryk M. Bec、Tom G. Driver

  DOI：10.1002/anie.201006917

  日期：2011.2.11

  Rings à la carte: Rhodium carboxylate complexes catalyze selective cascade reactions to produce a range 2,3‐disubstituted indoles from β,β‐disubstituted stryryl azides. The selective migration of aryl groups appears to originate from a putative phenonium ion reactive intermediate (see scheme).

  点菜环：羧酸铑配合物催化选择性级联反应，从 β,β-二取代苯乙烯基叠氮化物产生一系列 2,3-二取代吲哚。芳基的选择性迁移似乎源自假定的苯鎓离子反应中间体（参见方案）。
• Catalytic Enantioselective Cross-Couplings of Secondary Alkyl Electrophiles with Secondary Alkylmetal Nucleophiles: Negishi Reactions of Racemic Benzylic Bromides with Achiral Alkylzinc Reagents
  作者：Jörg T. Binder、Christopher J. Cordier、Gregory C. Fu

  DOI：10.1021/ja308460z

  日期：2012.10.17

  We have developed a nickel-catalyzed method for the asymmetric cross-coupling of secondary electrophiles with secondary nucleophiles, specifically, stereoconvergent Negishi reactions of racemic benzylic bromides with achiral cycloalkylzinc reagents. In contrast to most previous studies of enantioselective Negishi cross-couplings, tridentate pybox ligands are ineffective in this process; however, a

  我们开发了一种镍催化的方法，用于二级亲电试剂与二级亲核试剂的不对称交叉偶联，特别是外消旋苄基溴与非手性环烷基锌试剂的立体聚合 Negishi 反应。与之前大多数对映选择性 Negishi 交叉偶联的研究相比，三齿 pybox 配体在此过程中无效；然而，一种新的、易于获得的双齿异喹啉-恶唑啉配体提供了出色的 ee 和良好的产率。使用无环烷基锌试剂作为偶联伙伴导致发现了一种非常不寻常的异构化，该异构化可从未支化的亲核试剂中产生大量的支化交叉偶联产物。
• Catalytic Enantioselective Protoboration of Disubstituted Allenes. Access to Alkenylboron Compounds in High Enantiomeric Purity
  作者：Hwanjong Jang、Byunghyuck Jung、Amir H. Hoveyda

  DOI：10.1021/ol5022417

  日期：2014.9.5

  Proto-boryl additions to 1,1-disubstituted allenes in the presence of 1.0–5.0 mol % of chiral NHC–Cu complexes, B2(pin)2, and t-BuOH proceed to afford alkenyl–B(pin) products in up to 98% yield, >98:2 site selectivity, and 98:2 er. The enantiomerically enriched alkenylboron products can be converted to otherwise difficult-to-access alkenyl bromides, methyl ketones or carboxylic acids. What’s more,

  在 1.0–5.0 mol% 的手性 NHC-Cu 配合物、B 2 (pin) 2和t- BuOH存在下，原硼基加成到 1,1-二取代的丙二烯上，得到烯基-B(pin) 产物高达 98% 的产率、>98:2 的位点选择性和 98:2 er。富含对映异构体的烯基硼产物可以转化为其他难以获得的烯基溴化物、甲基酮或羧酸。此外，相应的硼酸可用于高度立体选择性的 NHC-Cu 催化的烯丙基取代反应。