5-bromo-1,5-diphenylpentan-1-one | 109395-25-7

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 5-bromo-1,5-diphenylpentan-1-one
• 英文别名: 5-Brom-1,5-diphenyl-pentan-1-on
• CAS: 109395-25-7
• 化学式: C₁₇H₁₇BrO
• 分子量: 317.225
• InChiKey: VDYVTUAEPGPLHD-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.5
• 重原子数：
  19
• 可旋转键数：
  6
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.24
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  5-bromo-1,5-diphenylpentan-1-one 在 氢氧化钾 作用下， 生成 1.5-Diphenyl-1-penten-5-one
  参考文献：
  名称：

  Azo Compounds.¹ The Preparation and Oxidation of 3,7-Diphenylhexahydro-1,2-diazepine

  摘要：

  DOI：

  10.1021/ja01598a075
• 作为产物：
  描述：

  肉桂基亚苯乙酮 在 N-溴代丁二酰亚胺(NBS) 、 Wilkinson's catalyst 、 过氧化氢苯甲酰 、 氢气 作用下， 以 四氯化碳 、 乙醇 、 苯 为溶剂， 50.0 ℃ 、344.73 kPa 条件下， 反应 1.75h， 生成 5-bromo-1,5-diphenylpentan-1-one
  参考文献：
  名称：

  Stereocontrol between Remote Atom Centers in Acyclic Substrates. Anti Addition of Hydride to 1,5-, 1,6-, and 1,7-Hydroxy Ketones

  摘要：

  For conformationally unconstrained, acyclic organic compounds, the control of stereogenic centers at remote positions of a chain, that is, at a distance of four or more atom centers, remains a challenging problem in asymmetric synthesis. We report on our studies of 1,5, 1,6, and 1,7 diastereoselectivity in hydride reductions of acyclic hydroxy amino ketones and related compounds, which were sparked by our discovery of high 1,5 diastereocontrol (>10:1) with substrates such as 17 and 23. We have been able to achieve both high 1,5- and 1,6-anti diastereocontrol in the reduction of 1,5- and 1,6-hydroxy ketone substrates, respectively. However, the level of 1,7-anti diastereocontrol with 1,7-hydroxy ketones was only moderate. More specifically, reduction of 23 to 24 with R-alpine-hydride or Zn(BH4)(2) in CH2Cl2 (predominantly) at -78 degrees C gave high 1,5-anti stereoselectivity (anti/syn = 10:1 or 13:1, respectively), and reduction of 34 to 35 with R-alpine-hydride (CH2Cl2) gave high 1,6-anti selectivity (anti/syn = 12:1, respectively), whereas reduction of 46 to 44 with R-alpine-hydride (CH2Cl2) gave only moderate 1,7-anti stereoselectivity (anti/syn = 3:1). Results for reductions of 1,5- and 1,6-hydroxy ketone substrates having the N-benzyl structural subunit replaced (i.e., 27 --> 28, 29 --> 30, 31 --> 32, 52 --> 53, 54a --> 55a, 54b --> 55b, 54c --> 55c, and 56 --> 57) clearly indicate that the stereoelectronic character of this subunit plays a critical. role in the attainment of high anti asymmetric induction. Thus, while we obtained exceptionally high 1,6-anti stereoselectivity in the reduction of the N-mesitylmethyl substrate, 54c, to 1,6-diols 55c (anti/syn = 22:1) with R-alpine-hydride at -78 degrees C in CH2Cl2, the N-methyl substrate, 54b, gave a relatively modest anti/syn ratio of 3:1. The diminished anti/syn ratio of 4:1 in the R-alpine-hydride reduction of methoxy amino ketone 50 to 51 also indicates the importance of the free hydroxyl group for attaining high 1,6-anti stereoselectivity. To rationalize the high remote anti stereocontrol in such acyclic systems, we discuss a chelation-controlled mechanism, involving external hydride addition to a bicyclic metal complex with a coordinated ketone carbonyl (e.g., 33) vs internal hydride addition to a monocyclic metal complex with an uncoordinated ketone carbonyl (e.g., 58).

  DOI：

  10.1021/jo981341m

文献信息

• Enantioconvergent Cu-Catalyzed Radical C–N Coupling of Racemic Secondary Alkyl Halides to Access α-Chiral Primary Amines
  作者：Yu-Feng Zhang、Xiao-Yang Dong、Jiang-Tao Cheng、Ning-Yuan Yang、Li-Lei Wang、Fu-Li Wang、Cheng Luan、Juan Liu、Zhong-Liang Li、Qiang-Shuai Gu、Xin-Yuan Liu

  DOI：10.1021/jacs.1c07726

  日期：2021.9.22

  α-Chiral alkyl primary amines are virtually universal synthetic precursors for all other α-chiral N-containing compounds ubiquitous in biological, pharmaceutical, and material sciences. The enantioselective amination of common alkyl halides with ammonia is appealing for potential rapid access to α-chiral primary amines, but has hitherto remained rare due to the multifaceted difficulties in using ammonia

  α-手性烷基伯胺实际上是生物、制药和材料科学中普遍存在的所有其他α-手性含氮化合物的通用合成前体。普通烷基卤与氨的对映选择性胺化对于快速获得 α-手性伯胺很有吸引力，但由于使用氨的多方面困难和不发达的 C(sp 3 )-N 偶联，迄今为止仍然很少见。在这里，我们展示了亚砜亚胺作为优异的氨替代物，用于在温和的热条件下通过铜催化与不同的外消旋仲烷基卤化物（> 60 个例子）对映聚合自由基 C-N 偶联。该反应有效地提供了高度对映体富集的N-烷基亚砜亚胺（产率高达 99% 和 >99% ee），具有仲苄基、炔丙基、α-羰基烷基和 α-氰基烷基立体中心。此外，我们已将由此获得的掩蔽 α-手性伯胺转化为各种合成结构单元、配体和具有 α-手性 N-官能团的药物，如氨基甲酸酯、羧酰胺、仲和叔胺和恶唑啉，常见的α-取代模式。这些结果揭示了对映会聚自由基交叉偶联作为一般手性碳-杂原子形成策略的潜力。
• A general asymmetric copper-catalysed Sonogashira C(sp3)–C(sp) coupling
  作者：Xiao-Yang Dong、Yu-Feng Zhang、Can-Liang Ma、Qiang-Shuai Gu、Fu-Li Wang、Zhong-Liang Li、Sheng-Peng Jiang、Xin-Yuan Liu

  DOI：10.1038/s41557-019-0346-2

  日期：2019.12

  versatile reaction for the straightforward formation of C–C bonds, forging the carbon skeletons of broadly useful functionalized molecules. However, asymmetric Sonogashira coupling, particularly for C(sp3)–C(sp) bond formation, has remained largely unexplored. Here we demonstrate a general stereoconvergent Sonogashira C(sp3)–C(sp) cross-coupling of a broad range of terminal alkynes and racemic alkyl halides

  Sonogashira偶联的不断发展使它成为直接建立C–C键的公认且通用的反应，从而锻造了广泛有用的功能化分子的碳骨架。但是，特别是对于C（sp 3）–C（sp）键形成的非对称Sonogashira偶联，在很大程度上仍未得到开发。在这里，我们展示了一个一般的立体会聚Sonogashira C（sp 3）–C（sp）使用手性金鸡纳生物碱基的P，N-配体，通过铜催化的自由基参与的炔基化作用实现了广泛的末端炔烃和外消旋烷基卤化物（> 120实例）的交叉偶联。与工业相关的乙炔和丙炔已成功整合，为可扩展且经济的合成应用奠定了基础。该方法的潜在用途在具有丰富手性C（sp 3）–C（sp / sp 2 / sp 3）特征的立体富集的生物活性或功能分子衍生物，药物化合物和天然产物的简便合成中得到了证明。）债券。这项工作强调了自由基物种对发展对映会聚转化的重要性。
• Design of Hemilabile N,N,N-Ligands in Copper-Catalyzed Enantioconvergent Radical Cross-Coupling of Benzyl/Propargyl Halides with Alkenylboronate Esters
  作者：Peng-Fei Wang、Jiao Yu、Kai-Xin Guo、Sheng-Peng Jiang、Ji-Jun Chen、Qiang-Shuai Gu、Ji-Ren Liu、Xin Hong、Zhong-Liang Li、Xin-Yuan Liu

  DOI：10.1021/jacs.2c00957

  日期：2022.4.13

  halides with alkenylboronate esters is an appealing tool in the assembly of synthetically valuable enantioenriched alkenes owing to the ready availability, low toxicity, and air/moisture stability of alkenylboronate esters. Here, we report a copper/chiral N,N,N-ligand catalytic system for the enantioconvergent cross-coupling of benzyl/propargyl halides with alkenylboronate esters (>80 examples) with good

  对映收敛基团 C(sp 3 )–C(sp 2) 烷基卤化物与烯基硼酸酯的交叉偶联是合成有价值的对映体富集烯烃的一种有吸引力的工具，因为烯基硼酸酯易于获得、低毒性和空气/水分稳定性。在这里，我们报告了一种铜/手性 N,N,N-配体催化体系，用于苄基/炔丙基卤化物与烯基硼酸酯（>80 个实例）的对映收敛交叉偶联，具有良好的官能团耐受性。成功的关键是通过在一个配位喹啉环的邻位安装空间位阻来合理设计半可溶性N,N,N-配体。因此，新设计的配体不仅可以促进三齿形式的自由基交叉偶联过程，还可以对二齿形式的高反应性烷基自由基进行对映控制。
• 541. The relative stabilising influences of substituents on free alkyl radicals. Part V. Selective bromination by N-bromosuccinimide
  作者：R. L. Huang、Pearl Williams

  DOI：10.1039/jr9580002637

  日期：——
• Stereocontrol between Remote Atom Centers in Acyclic Substrates. Anti Addition of Hydride to 1,5-, 1,6-, and 1,7-Hydroxy Ketones
  作者：Han-Cheng Zhang、Bruce D. Harris、Michael J. Costanzo、Edward C. Lawson、Cynthia A. Maryanoff、Bruce E. Maryanoff

  DOI：10.1021/jo981341m

  日期：1998.10.1

  For conformationally unconstrained, acyclic organic compounds, the control of stereogenic centers at remote positions of a chain, that is, at a distance of four or more atom centers, remains a challenging problem in asymmetric synthesis. We report on our studies of 1,5, 1,6, and 1,7 diastereoselectivity in hydride reductions of acyclic hydroxy amino ketones and related compounds, which were sparked by our discovery of high 1,5 diastereocontrol (>10:1) with substrates such as 17 and 23. We have been able to achieve both high 1,5- and 1,6-anti diastereocontrol in the reduction of 1,5- and 1,6-hydroxy ketone substrates, respectively. However, the level of 1,7-anti diastereocontrol with 1,7-hydroxy ketones was only moderate. More specifically, reduction of 23 to 24 with R-alpine-hydride or Zn(BH4)(2) in CH2Cl2 (predominantly) at -78 degrees C gave high 1,5-anti stereoselectivity (anti/syn = 10:1 or 13:1, respectively), and reduction of 34 to 35 with R-alpine-hydride (CH2Cl2) gave high 1,6-anti selectivity (anti/syn = 12:1, respectively), whereas reduction of 46 to 44 with R-alpine-hydride (CH2Cl2) gave only moderate 1,7-anti stereoselectivity (anti/syn = 3:1). Results for reductions of 1,5- and 1,6-hydroxy ketone substrates having the N-benzyl structural subunit replaced (i.e., 27 --> 28, 29 --> 30, 31 --> 32, 52 --> 53, 54a --> 55a, 54b --> 55b, 54c --> 55c, and 56 --> 57) clearly indicate that the stereoelectronic character of this subunit plays a critical. role in the attainment of high anti asymmetric induction. Thus, while we obtained exceptionally high 1,6-anti stereoselectivity in the reduction of the N-mesitylmethyl substrate, 54c, to 1,6-diols 55c (anti/syn = 22:1) with R-alpine-hydride at -78 degrees C in CH2Cl2, the N-methyl substrate, 54b, gave a relatively modest anti/syn ratio of 3:1. The diminished anti/syn ratio of 4:1 in the R-alpine-hydride reduction of methoxy amino ketone 50 to 51 also indicates the importance of the free hydroxyl group for attaining high 1,6-anti stereoselectivity. To rationalize the high remote anti stereocontrol in such acyclic systems, we discuss a chelation-controlled mechanism, involving external hydride addition to a bicyclic metal complex with a coordinated ketone carbonyl (e.g., 33) vs internal hydride addition to a monocyclic metal complex with an uncoordinated ketone carbonyl (e.g., 58).