(S)-1-(2,4-dimethoxybenzyl)-3-methylpiperazine-2,5-dione | 204770-72-9

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: (S)-1-(2,4-dimethoxybenzyl)-3-methylpiperazine-2,5-dione
• CAS: 204770-72-9
• 化学式: C₁₄H₁₈N₂O₄
• 分子量: 278.308
• InChiKey: YGTYEBGWOLKNPS-VIFPVBQESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.55
• 重原子数：
  20.0
• 可旋转键数：
  4.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  67.87
• 氢给体数：
  1.0
• 氢受体数：
  4.0

反应信息

• 作为反应物：
  描述：

  (S)-1-(2,4-dimethoxybenzyl)-3-methylpiperazine-2,5-dione 在 sodium carbonate 、 lithium hexamethyldisilazane 作用下， 以 二氯甲烷 为溶剂， 反应 3.33h， 生成 (1R,4S)-2-(2,4-Dimethoxy-benzyl)-4-methyl-1-(4-methyl-benzyl)-1,2-dihydro-2,4a,9-triaza-anthracene-3,10-dione
  参考文献：
  名称：

  New findings in the alkylation and N-deprotection of (4S)-4-methyl-2-benzyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones

  摘要：

  Alkyl halides behave differently to benzyl halides in C-1 alkylation of the title compounds. The syn and anti 1,4-disubstituted diastereomers thus obtained show different regioselectivity by further alkylation leading to the 1,4,4- and 1,1,4-trisubstituted compounds, respectively. Alkylation is always directed anti with respect to the bulkier substituent at C-1 or C-4. Debenzylation attempts on 2-benzyl-derivatives 1b by treatment with HCOOH and C/Pd or H-2/C-Pd/MeOH/H+ led to C-1 oxidised or 7,8,9,10-tetrahydro-derivatives. Deprotection of 2-p-methoxybenzyl- and 2-(2,4-dimethoxybenzyl)-derivatives with CAN and with TFA/anisole, respectively, was successful, but in the latter case epimerization at C-1 occurred. (C) 1998 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(97)00629-0
• 作为产物：
  描述：

  [((S)-2-Benzyloxycarbonylamino-propionyl)-(2,4-dimethoxy-benzyl)-amino]-acetic acid ethyl ester 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 为溶剂， 反应 26.0h， 生成 (S)-1-(2,4-dimethoxybenzyl)-3-methylpiperazine-2,5-dione
  参考文献：
  名称：

  New findings in the alkylation and N-deprotection of (4S)-4-methyl-2-benzyl-2,4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones

  摘要：

  Alkyl halides behave differently to benzyl halides in C-1 alkylation of the title compounds. The syn and anti 1,4-disubstituted diastereomers thus obtained show different regioselectivity by further alkylation leading to the 1,4,4- and 1,1,4-trisubstituted compounds, respectively. Alkylation is always directed anti with respect to the bulkier substituent at C-1 or C-4. Debenzylation attempts on 2-benzyl-derivatives 1b by treatment with HCOOH and C/Pd or H-2/C-Pd/MeOH/H+ led to C-1 oxidised or 7,8,9,10-tetrahydro-derivatives. Deprotection of 2-p-methoxybenzyl- and 2-(2,4-dimethoxybenzyl)-derivatives with CAN and with TFA/anisole, respectively, was successful, but in the latter case epimerization at C-1 occurred. (C) 1998 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(97)00629-0

文献信息

• Highly efficient enantioselective synthesis of 1,3-disubstituted 2,5-diketopiperazine derivatives via microwave irradiation
  作者：Si Yeon Han、Young-Dae Gong

  DOI：10.1080/00397911.2019.1671983

  日期：2019.12.17

  Abstract Chiral 2,5-diketopiperazine (2,5-DKP) derivatives have a broad range of biological activities in the medicinal field. The synthetic protocols of 1,3-disubstituted 2,5-DKPs via base-catalyzed cyclization of chloroacetamide have been reported. However, there are several drawbacks, such as an overly long reaction time, low to moderate yield, and racemization of the products. The sequence modified

  摘要 手性2,5-二酮哌嗪（2,5-DKP）衍生物在医药领域具有广泛的生物活性。1,3-二取代的 2,5-DKPs 通过碱催化环化氯乙酰胺的合成方案已有报道。然而，存在一些缺点，例如过长的反应时间、低到中等的产率以及产物的外消旋化。本文修饰的 1,3-二取代 2,5-DKP 序列涉及微波辅助环化。它提高了产率并缩短了反应时间。此外，采用 N-PMB 保护可防止外消旋化，这在碱催化的环化反应中经常发生。因此，成功建立了通过微波反应快速合成对映体纯1,3-二取代2,5-DKPs的方法。