5-甲基-6-(4-甲基苯基)-2,3-二氢吡嗪 | 137465-83-9

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 中文名称: 5-甲基-6-(4-甲基苯基)-2,3-二氢吡嗪
• 中文别名: 吡嗪,2,3-二氢-5-甲基-6-(4-甲基苯基)-(9CI)；间甲苯甲酰氯，4-乙氧基-(7CI)
• 英文名称: 5-methyl-6-(4-methylphenyl)-2,3-dihydropyrazine
• CAS: 137465-83-9
• 化学式: C₁₂H₁₄N₂
• 分子量: 186.257
• InChiKey: DSFOKOSNKNAKPN-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.2
• 重原子数：
  14
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  24.7
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  5-甲基-6-(4-甲基苯基)-2,3-二氢吡嗪 在 rose bengal 氧气 作用下， 以 乙腈 为溶剂， 以65%的产率得到1-isocyano-2-(p-toluylamino)ethane
  参考文献：
  名称：

  Photooxygenation of 1,4-diaza-1,3-butadienes (.alpha.-diimines): formation of isonitriles

  摘要：

  Dye-sensitized photooxygenations of cyclic and acyclic 1,4-diaza-1,3-butadienes (alpha-diimines), carrying a methyl or an ethyl group in the 2-position, yield isonitriles and amides, as well as formaldehyde or acetaldehyde. Thus, cyclic alpha-diimines such as 5,6-dimethyl- (1a), 5-methyl-6-phenyl- (1b), 5-methyl-6-(p-tolyl)- (1c), and 5,6-diethyl-2,3-dihydropyrazine (1d) yield the respective 1-isocyano-2-(acylamino)ethanes 2a-d, whereas 5-isopropyl-6-phenyl- (1e) and 5,6-diphenyl-2,3-dihydropyrazine (1f) are inert toward photooxygenation. Acyclic alpha-diimines such as 1,8-bis(acetylamino)-3,6-diaza-4,5-dimethyl-3,5-octadiene (4a), 2,5-diaza-3,4-dimethyl-2,4-hexadiene (4b), 1,4-diaza-2,3-dimethyl-1,4-diphenyl-1,3-butadiene (4c), and N,N'-bis[(1S,2S,3S,5R)-pinan-3-ylmethyl]-2,3-butanediimine (4d) afford the respective isonitriles 5a-d and acetamides 6a-d. With retention of configuration, chiral alpha-diimines such as (-)-N,N'-bis[(S)-1-phenylethyl]-2,3-butanediimine [(S,S)-4e] and its R,R enantiomer [(R,R,)-4e], and (3S,8S)-(-)-3,8-dicarbomethoxy-4,7-diaza-2,5,6,9-tetramethyl-4,6-decadiene [(S,S)-4f] yield the corresponding enantiomerically pure isonitriles (S)-5e, (R)-5e, and (S)-5f and acetamides (S)-6e, (R)-6e, and (S)-6f. Evidence for a singlet oxygen reaction is presented. A working hypothesis is proposed which includes the formation of a transient hydroperoxide 7 that fragments into an isonitrile molecule, an aldehyde, and an N-alkyl- or N-arylnitrilium cation and a hydroxide ion; the latter combine to yield the amide groups in 2a-d and the amide compounds 6a-f.

  DOI：

  10.1021/jo00027a041
• 作为产物：
  描述：

  1-(4-甲基苯基)-1,2-丙二酮 、 乙二胺 以75%的产率得到5-甲基-6-(4-甲基苯基)-2,3-二氢吡嗪
  参考文献：
  名称：

  Photooxygenation of 1,4-diaza-1,3-butadienes (.alpha.-diimines): formation of isonitriles

  摘要：

  Dye-sensitized photooxygenations of cyclic and acyclic 1,4-diaza-1,3-butadienes (alpha-diimines), carrying a methyl or an ethyl group in the 2-position, yield isonitriles and amides, as well as formaldehyde or acetaldehyde. Thus, cyclic alpha-diimines such as 5,6-dimethyl- (1a), 5-methyl-6-phenyl- (1b), 5-methyl-6-(p-tolyl)- (1c), and 5,6-diethyl-2,3-dihydropyrazine (1d) yield the respective 1-isocyano-2-(acylamino)ethanes 2a-d, whereas 5-isopropyl-6-phenyl- (1e) and 5,6-diphenyl-2,3-dihydropyrazine (1f) are inert toward photooxygenation. Acyclic alpha-diimines such as 1,8-bis(acetylamino)-3,6-diaza-4,5-dimethyl-3,5-octadiene (4a), 2,5-diaza-3,4-dimethyl-2,4-hexadiene (4b), 1,4-diaza-2,3-dimethyl-1,4-diphenyl-1,3-butadiene (4c), and N,N'-bis[(1S,2S,3S,5R)-pinan-3-ylmethyl]-2,3-butanediimine (4d) afford the respective isonitriles 5a-d and acetamides 6a-d. With retention of configuration, chiral alpha-diimines such as (-)-N,N'-bis[(S)-1-phenylethyl]-2,3-butanediimine [(S,S)-4e] and its R,R enantiomer [(R,R,)-4e], and (3S,8S)-(-)-3,8-dicarbomethoxy-4,7-diaza-2,5,6,9-tetramethyl-4,6-decadiene [(S,S)-4f] yield the corresponding enantiomerically pure isonitriles (S)-5e, (R)-5e, and (S)-5f and acetamides (S)-6e, (R)-6e, and (S)-6f. Evidence for a singlet oxygen reaction is presented. A working hypothesis is proposed which includes the formation of a transient hydroperoxide 7 that fragments into an isonitrile molecule, an aldehyde, and an N-alkyl- or N-arylnitrilium cation and a hydroxide ion; the latter combine to yield the amide groups in 2a-d and the amide compounds 6a-f.

  DOI：

  10.1021/jo00027a041

文献信息

• Photooxygenation of 1,4-diaza-1,3-butadienes (.alpha.-diimines): formation of isonitriles
  作者：Klaus Gollnick、Sigrid Koegler、Dorothee Maurer

  DOI：10.1021/jo00027a041

  日期：1992.1

  Dye-sensitized photooxygenations of cyclic and acyclic 1,4-diaza-1,3-butadienes (alpha-diimines), carrying a methyl or an ethyl group in the 2-position, yield isonitriles and amides, as well as formaldehyde or acetaldehyde. Thus, cyclic alpha-diimines such as 5,6-dimethyl- (1a), 5-methyl-6-phenyl- (1b), 5-methyl-6-(p-tolyl)- (1c), and 5,6-diethyl-2,3-dihydropyrazine (1d) yield the respective 1-isocyano-2-(acylamino)ethanes 2a-d, whereas 5-isopropyl-6-phenyl- (1e) and 5,6-diphenyl-2,3-dihydropyrazine (1f) are inert toward photooxygenation. Acyclic alpha-diimines such as 1,8-bis(acetylamino)-3,6-diaza-4,5-dimethyl-3,5-octadiene (4a), 2,5-diaza-3,4-dimethyl-2,4-hexadiene (4b), 1,4-diaza-2,3-dimethyl-1,4-diphenyl-1,3-butadiene (4c), and N,N'-bis[(1S,2S,3S,5R)-pinan-3-ylmethyl]-2,3-butanediimine (4d) afford the respective isonitriles 5a-d and acetamides 6a-d. With retention of configuration, chiral alpha-diimines such as (-)-N,N'-bis[(S)-1-phenylethyl]-2,3-butanediimine [(S,S)-4e] and its R,R enantiomer [(R,R,)-4e], and (3S,8S)-(-)-3,8-dicarbomethoxy-4,7-diaza-2,5,6,9-tetramethyl-4,6-decadiene [(S,S)-4f] yield the corresponding enantiomerically pure isonitriles (S)-5e, (R)-5e, and (S)-5f and acetamides (S)-6e, (R)-6e, and (S)-6f. Evidence for a singlet oxygen reaction is presented. A working hypothesis is proposed which includes the formation of a transient hydroperoxide 7 that fragments into an isonitrile molecule, an aldehyde, and an N-alkyl- or N-arylnitrilium cation and a hydroxide ion; the latter combine to yield the amide groups in 2a-d and the amide compounds 6a-f.