3-Methyl-4-isopropyl-1,3-oxazolidine-2,5-dione | 90970-98-2

• 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: 3-Methyl-4-isopropyl-1,3-oxazolidine-2,5-dione
• 英文别名: (4S)-3-methyl-4-propan-2-yl-1,3-oxazolidine-2,5-dione
• CAS: 90970-98-2
• 化学式: C₇H₁₁NO₃
• 分子量: 157.169
• InChiKey: HMFJXFKAYXONNA-YFKPBYRVSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.1
• 重原子数：
  11
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.71
• 拓扑面积：
  46.6
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  Boc-N-甲基-L-缬氨酸 在 N-methyl L-valine methyl ester hydrochloride 、 N,N-二异丙基乙胺 、 chlorotri(pyrrolidin-1-yl)phosphonium hexafluorophosphate 作用下， 以 二氯甲烷 为溶剂， 以36%的产率得到-N-methyl-L-valine methyl ester
  参考文献：
  名称：

  Coupling N-Methylated Amino Acids Using PyBroP and PyCloP Halogenophosphonium Salts: Mechanism and Fields of Application

  摘要：

  PyBroP (1) and PyCloP (2), two halotripyrrolidinophosphonium hexafluorophosphates, are peptide-coupling reagents highly efficient for coupling N-methylated amino esters, in contrast with PyBOP (3), the hydroxybenzotriazolyl analogue. These halogenophosphonium salts 1 and 2 are convenient (one-pot reactions) stable solids soluble in conventional solvents. Use of them gave an excellent peptide yield with essentially no epimerization. Activation with these reagents probably involves the formation of an (acyloxy)phosphonium, as shown in the case of 2,4,6-trimethylbenzoic acid activation. In the case of reagents 1 and 2, oxazolone and/or a symmetrical anhydride were intermediates which were rapidly aminolyzed. In contrast, the benzotriazolyl ester intermediate which was formed with PyBOP (3) was poorly reactive with N-methylated amino esters. PyBroP (1) and PyCloP (2) were less efficient in the coupling of some Boc-amino acids because of N-carboxyanhydride formation; this was particularly the case when Boc-Val-OH or Boc-MeVal-OH was coupled with MeVal-OMe.

  DOI：

  10.1021/jo00088a027

文献信息

• <i>N</i>-Carboxyanhydrides directly from amino acids and carbon dioxide and their tandem reactions to therapeutic alkaloids
  作者：Thi V. Tran、Yi Shen、Hieu D. Nguyen、Shijie Deng、Hootan Roshandel、Mason M. Cooper、Jose R. Watson、Jeffery A. Byers、Paula L. Diaconescu、Loi H. Do

  DOI：10.1039/d2gc03507c

  日期：——

  versatile N-carboxyanhydrides (NCAs) directly from amino acids and CO2 using n-propylphosphonic anhydride. Most of the NCAs were isolated with >95% purity after simple workup, avoiding the need for tedious purification procedures typically required using conventional methods. Because the reagents and conditions employed are mild, tandem reactions with moisture-sensitive NCAs were carried out to transform

  我们报告了使用正丙基膦酸酐直接从氨基酸和 CO 2制备综合通用的N-羧基酸酐 (NCA) 。大多数 NCA 在简单的后处理后以 > 95% 的纯度被分离出来，避免了使用传统方法通常需要的繁琐纯化程序的需要。由于所使用的试剂和条件温和，因此与对水分敏感的 NCA 进行串联反应，将它们在一锅中转化为药用生物碱色胺菊酯和 Phaitanthrin A。定性分析表明，我们的 NCA 合成方法比直接或间接使用剧毒气体光气的传统方法更环保。
• N-methyl N-carboxyanhydride: an unexpected by-product when coupling boc-n-methyl amino acids
  作者：Eric Frérot、Jacques Coste、Joël Poncet、Patrick Jouin、Bertrand Castro

  DOI：10.1016/s0040-4039(00)78866-6

  日期：1992.5

  Activation of Boc-amino acids and Boc-N-methyl amino acids leads to the corresponding NCA. This side reaction explains the low yields obtained when coupling N-methyl amino acids. It was not observed with the Z- or Fmoc-protective groups.
• Coupling N-Methylated Amino Acids Using PyBroP and PyCloP Halogenophosphonium Salts: Mechanism and Fields of Application
  作者：Jacques Coste、Eric Frerot、Patrick Jouin

  DOI：10.1021/jo00088a027

  日期：1994.5

  PyBroP (1) and PyCloP (2), two halotripyrrolidinophosphonium hexafluorophosphates, are peptide-coupling reagents highly efficient for coupling N-methylated amino esters, in contrast with PyBOP (3), the hydroxybenzotriazolyl analogue. These halogenophosphonium salts 1 and 2 are convenient (one-pot reactions) stable solids soluble in conventional solvents. Use of them gave an excellent peptide yield with essentially no epimerization. Activation with these reagents probably involves the formation of an (acyloxy)phosphonium, as shown in the case of 2,4,6-trimethylbenzoic acid activation. In the case of reagents 1 and 2, oxazolone and/or a symmetrical anhydride were intermediates which were rapidly aminolyzed. In contrast, the benzotriazolyl ester intermediate which was formed with PyBOP (3) was poorly reactive with N-methylated amino esters. PyBroP (1) and PyCloP (2) were less efficient in the coupling of some Boc-amino acids because of N-carboxyanhydride formation; this was particularly the case when Boc-Val-OH or Boc-MeVal-OH was coupled with MeVal-OMe.