8-methoxy-3-methylimidazo[1,5-a]pyrazine | 1040751-52-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 咪唑并[1,5-a]吡嗪
• 英文名称: 8-methoxy-3-methylimidazo[1,5-a]pyrazine
• CAS: 1040751-52-7
• 化学式: C₈H₉N₃O
• 分子量: 163.179
• InChiKey: LTNXWQVXHFJJCR-UHFFFAOYSA-N

物化性质

• 熔点：
  94-95 °C(Solv: ethyl acetate (141-78-6); hexane (110-54-3))
• 密度：
  1.26±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  12
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  39.4
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  8-methoxy-3-methylimidazo[1,5-a]pyrazine 在 正丁基锂 、 氘代甲醇-d 作用下， 以 四氢呋喃 、 正己烷 为溶剂， 以94%的产率得到8-methoxy-3-methylimidazo[1,5-a]pyrazine-5-d
  参考文献：
  名称：

  Palladium-Catalyzed Direct Heck Arylation of Dual π-Deficient/π-Excessive Heteroaromatics. Synthesis of C-5 Arylated Imidazo[1,5-a]pyrazines

  摘要：

  A general and efficient synthesis of 5-aryl imidazo[1,5-a]pyrazines by palladium-catalyzed coupling of the corresponding 8-substituted derivatives with aryl halides is described. The scope of this new reaction for the imidazo[1,5-a]pyrazine ring system was explored using three readily available 8-substituted precursors, X = NH2, NMe2, and OMe, as well as 8-aryl derivatives, X = Ar'. On the basis of these results as well as studies using a deuterated derivative, a Heck-like mechanism is proposed for this transformation.

  DOI：

  10.1021/ol800761r
• 作为产物：
  描述：

  甲醇 、 8-chloro-3-methylimidazo[1,5-a]pyrazine 在 sodium 作用下， 以 甲醇 为溶剂， 以85%的产率得到8-methoxy-3-methylimidazo[1,5-a]pyrazine
  参考文献：
  名称：

  Palladium-Catalyzed Direct Heck Arylation of Dual π-Deficient/π-Excessive Heteroaromatics. Synthesis of C-5 Arylated Imidazo[1,5-a]pyrazines

  摘要：

  A general and efficient synthesis of 5-aryl imidazo[1,5-a]pyrazines by palladium-catalyzed coupling of the corresponding 8-substituted derivatives with aryl halides is described. The scope of this new reaction for the imidazo[1,5-a]pyrazine ring system was explored using three readily available 8-substituted precursors, X = NH2, NMe2, and OMe, as well as 8-aryl derivatives, X = Ar'. On the basis of these results as well as studies using a deuterated derivative, a Heck-like mechanism is proposed for this transformation.

  DOI：

  10.1021/ol800761r

文献信息

• Synthesis of Substituted Imidazo[1,5-<i>a</i>]pyrazines via Mono-, Di-, and Directed Remote Metalation Strategies
  作者：Johnathan Board、Jian-Xin Wang、Andrew P. Crew、Meizhong Jin、Kenneth Foreman、Mark J. Mulvihill、Victor Snieckus

  DOI：10.1021/ol901889e

  日期：2009.11.19

  Imidazo[1,5-a]pyrazines 1 undergo regioselective C3-metalation and C5/C3-dimetalation to afford a range of functionalized derivatives 2a−2g (Table 1), and 4a−4d (Table 2). Under similar conditions, the C3-methyl derivatives 2a and 5 undergo surprising regioselective C5-deprotonation to afford, after electrophile quench, products 4b and 6a−6p (Table 3), results that are rationalized by quantum mechanical

  咪唑并[1,5- a ]吡嗪1经历区域选择性的C3-金属化和C5 / C3-双金属化，从而提供一系列功能化的衍生物2a - 2g（表1）和4a - 4d（表2）。在相似的条件下，C3-甲基衍生物2a和5经历令人惊讶的区域选择性C5-去质子化，在亲电淬灭后得到产物4b和6a - 6p（表3），该结果通过量子力学计算得以合理化。苯甲酰胺7b得自这种金属化化学方法，随后是铃木交叉偶联的S -C，经定向远程金属化-环化，得到8，代表迄今未知​​的三氮杂二苯并[ cd，f ] azulen -7（6 H）-一个三环系统。