5-溴-2,2'-二氯-[4,4']联吡啶基 | 1227402-55-2

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡啶及其衍生物
• 中文名称: 5-溴-2,2'-二氯-[4,4']联吡啶基
• 英文名称: 5-bromo-2,2'-dichloro-[4,4']bipyridinyl
• 英文别名: 5-Bromo-2-chloro-4-(2-chloropyridin-4-yl)pyridine
• CAS: 1227402-55-2
• 化学式: C₁₀H₅BrCl₂N₂
• 分子量: 303.973
• InChiKey: RBFIJQOPBHEIHM-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4
• 重原子数：
  15
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  25.8
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  5-溴-2-氯吡啶 、 lithium diisopropyl amide 在 水 作用下， 以 四氢呋喃 为溶剂， 反应 1.0h， 以13%的产率得到2,2'-dichloro-5,5'dibromo-4,4'-bipyridine
  参考文献：
  名称：

  Synthesis of Polyhalogenated 4,4′-Bipyridines via a Simple Dimerization Procedure

  摘要：

  Polyhalogenated 4,4'-bipyridines were conveniently synthesized in a single step starting from dihalo-pyridines. A mechanism was proposed on the basis of experiments performed with 2-chloro-5-bromopyridine I a. 2-Chloro-4-lithio-5-bromopyridine A1 was produced via ortholithiation of la by using either LDA or t-BuLi bases. When LDA was used, chiller 3a containing two chlorines and two bromine atoms was formed predominantly accompanied by several byproducts whose structure and mechanism of formation are discussed. In the case of t-BuLi, although the major product was 2-chloropyridine 7, a new pyridone product 8 was formed that is probably the result of the dihydropyridine intermediate hydrolysis. The dimerization procedure involving LDA was employed to prepare a large number of halogenated 4,4'-bipyridines in moderate to good yields. In some specific cases, halogenated 3,4' and 2,4'-bipyridines were obtained in lower yields and their structures were unambiguously assigned by X-ray diffraction analysis.

  DOI：

  10.1021/jo100152e

文献信息

• Lithiation of Prochiral 2,2′-Dichloro-5,5′-dibromo-4,4′-bipyridine as a Tool for the Synthesis of Chiral Polyhalogenated 4,4′-Bipyridines
  作者：Victor Mamane、Emmanuel Aubert、Paola Peluso、Sergio Cossu

  DOI：10.1021/jo401255q

  日期：2013.8.2

  achiral tetrahalogenated 4,4′-bipyridine 1 with alkyllithiums was investigated. n-BuLi was found to induce either the chlorine-directed deprotolithiation reaction alone or with a concomitant halogen–lithium exchange furnishing after iodine trapping chiral 4,4′-bipyridines 2 and 6, respectively. The role of n-BuLi in the deprotolithiation process of 1 was elucidated on the basis of isolated secondary derivatives

  研究了非手性四卤代4,4'-联吡啶1与烷基锂的锂化。在碘分别捕获手性4,4'-联吡啶2和6后，发现n -BuLi单独诱导氯定向脱锂反应或伴随卤素-锂交换。基于分离的二级衍生物，阐明了n -BuLi在1的去锂化过程中的作用。去原锂化后，锂化的物种可能被不同的亲电试剂（例如MeI，TMCCl，MeSSMe，R 3 SnCl（R = Me或n -Bu）和PPh 2）捕获。Cl。此外，4,4'-联吡啶2经历了交叉偶联反应（铃木和Sonogashira），选择性地发生在碳碘键上。通过手性HPLC（高效液相色谱）分离该新的对映异构体4,4'-联吡啶家族的所有化合物，并使用反常色散通过XRD（X射线衍射）确定获得的对映异构体的绝对构型。