(+)-(1'R,4S)-4-methyl-2-(1'-phenylethyl)-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione | 799782-96-0

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二氮杂萘
• 英文名称: (+)-(1'R,4S)-4-methyl-2-(1'-phenylethyl)-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione
• 英文别名: (4S)-4-methyl-2-[(1R)-1-phenylethyl]-1,4-dihydropyrazino[2,1-b]quinazoline-3,6-dione
• CAS: 799782-96-0
• 化学式: C₂₀H₁₉N₃O₂
• 分子量: 333.39
• InChiKey: XEUOVCFYBBHCEJ-KGLIPLIRSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  25
• 可旋转键数：
  2
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  53
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  碘甲烷 、 (+)-(1'R,4S)-4-methyl-2-(1'-phenylethyl)-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione 在 lithium hexamethyldisilazane 作用下， 以 四氢呋喃 为溶剂， 反应 0.5h， 以76%的产率得到(+)-(1'R,1S,4S)-1,4-dimethyl-2-(1'-phenylethyl)-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione
  参考文献：
  名称：

  Influence of N(2)-substitution in the alkylation of (4S)-alkyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones

  摘要：

  1-Alkylation of O(3)-lactim, N(11)-azaenolate dilithium species derived from N(2)-H compounds 1a and 1b and the lithium azaenolates derived from the N(2)-phenyl and N(2)-(1-arylethyl) substituted compounds 2, 3 and 4 is studied. In 1 the trans-diastereoselectivity of 1-alkylation is controlled by 1,4-asyrnmetric induction, with some of these products prect.rsors of the ent-ardeemin framework. By contrast in compounds 2-4, the stabilization of the lithium azaenolate imposed by the phenyl substituent in 2, and the repulsive steric 1,2- interactions present in the initially formed 1,4-trans derivatives of 3 and 4, favou a C(1)-epimerization to the 1,4-cis isomers. (C) 2004 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetasy.2004.07.034
• 作为产物：
  描述：

  (1'R,3S)-3-methyl-1-(1-phenylethyl)piperazine-2,5-dione 在 sodium carbonate 作用下， 以 二氯甲烷 为溶剂， 反应 3.0h， 生成 (+)-(1'R,4S)-4-methyl-2-(1'-phenylethyl)-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-dione
  参考文献：
  名称：

  Influence of N(2)-substitution in the alkylation of (4S)-alkyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones

  摘要：

  1-Alkylation of O(3)-lactim, N(11)-azaenolate dilithium species derived from N(2)-H compounds 1a and 1b and the lithium azaenolates derived from the N(2)-phenyl and N(2)-(1-arylethyl) substituted compounds 2, 3 and 4 is studied. In 1 the trans-diastereoselectivity of 1-alkylation is controlled by 1,4-asyrnmetric induction, with some of these products prect.rsors of the ent-ardeemin framework. By contrast in compounds 2-4, the stabilization of the lithium azaenolate imposed by the phenyl substituent in 2, and the repulsive steric 1,2- interactions present in the initially formed 1,4-trans derivatives of 3 and 4, favou a C(1)-epimerization to the 1,4-cis isomers. (C) 2004 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetasy.2004.07.034