4-{4'-[(tert-butyloxycarbonyl)amino]benzyl}phenylisocyanate | 474124-93-1

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 4-{4'-[(tert-butyloxycarbonyl)amino]benzyl}phenylisocyanate
• 英文别名: tert-butyl [4-(4-isocyanatobenzyl)phenyl]carbamate
• CAS: 474124-93-1
• 化学式: C₁₉H₂₀N₂O₃
• 分子量: 324.379
• InChiKey: PVDBWNBXRJZCJG-UHFFFAOYSA-N

物化性质

• 沸点：
  412.9±38.0 °C(Predicted)
• 密度：
  1.10±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.59
• 重原子数：
  24.0
• 可旋转键数：
  4.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.26
• 拓扑面积：
  67.76
• 氢给体数：
  1.0
• 氢受体数：
  4.0

反应信息

• 作为反应物：
  描述：

  4-{4'-[(tert-butyloxycarbonyl)amino]benzyl}phenylisocyanate 在 盐酸 、 碳酸氢钠 、 三氟乙酸 作用下， 以 1,4-二氧六环 、 水 为溶剂， 反应 2.5h， 生成 [1-[4-(4-aminobenzyl)phenyl]-2,5-dioxo-(4,5-¹³C₂,3-¹⁵N)imidazolidin-4-yl](¹³C₂)acetic acid
  参考文献：
  名称：

  合成方法获得4,4'-亚甲基二苯基二异氰酸酯的氨基酸加合物

  摘要：

  4,4'-亚甲基二苯基二异氰酸酯（MDI）是化学工业中最重要的异氰酸酯。暴露于MDI后，肺部过敏和哮喘是主要的损害类型。MDI的白蛋白加合物可能与致敏反应的病因有关。因此，必须有敏感的和特定的生物标记物，例如血液蛋白加合物，以监测暴露于异氰酸酯的人。为了发现体内存在的血液蛋白与新的异氰酸酯加合物，需要新的合成标准品。为此，我们开发了五种方法来获得MDI的氨基酸加合物。我们合成并分离了天冬氨酸，谷氨酸，半胱氨酸和缬氨酸的MDI加合物。新的加合物通过LC-MS / MS和NMR进行表征。我们合成了相应的同位素标记的MDI加合物，以开发使用LC-MS / MS的分析方法。异氰酸酯的谷胱甘肽加合物是将反应性异氰酸酯转移到远离原始暴露部位的较远部位的一种重要方式。因此，我们使用了MDI的N-乙酰基-半胱氨酸加成物：N-乙酰基-S [[[4-（4-氨基苄基）苯基]氨基甲酰基]-半胱氨酸（MDI-AcCys）和N-乙酰基-S

  DOI：

  10.1021/tx300347e
• 作为产物：
  描述：

  以 甲苯 为溶剂， 反应 1.0h， 生成 4-{4'-[(tert-butyloxycarbonyl)amino]benzyl}phenylisocyanate
  参考文献：
  名称：

  Synthesis, Characterization, and Solvolysis of Mono- and Bis-S-(glutathionyl) Adducts of Methylene-bis-(phenylisocyanate) (MDI)

  摘要：

  Bifunctional isocyanates are highly reactive compounds that undergo nucleophilic attack by a variety of functional groups available in the biological system. While the etiology of the respiratory disease caused by diisocyanates is not fully understood, a great deal of research has been performed to elucidate the chemical mechanisms involved in the direct and indirect effects of these compounds. Since adducts of isocyanates are found not only to proteins along the entire respiratory tree but also to proteins in the circulatory system, it is likely that a transport mechanism for the isocyanate from the respiratory to the circulatory system exists. The initial reaction of isocyanates with cellular thiols to form thiocarbamates, which are known to release the isocyanate under physiological conditions, is believed to provide a possible carrier mechanism for the isocyanate functional group. Previous work with aliphatic mono-isocyanates and the aromatic diisocyanate toluene diisocyanate has demonstrated the feasibility of this mechanisin. Adding to this database, the products of the reaction of the highly water-insoluble, low vapor pressure, methylene-bis-(phenylisocyanate) (MDI) with glutathione were synthesized, and their chemical stability under various pH and buffer conditions was tested. Novel synthetic routes were developed for both the mono- and bis-S-(glutathionyl) adducts with MDI that yielded each compound in analytically pure form. Both compounds were found to be unstable under mild basic conditions (phosphate-buffered saline, pH 7.4, and NaHCO3, pH 8.2), however to a different degree. Furthermore, a significant influence of the pH value (the rate of degradation increases with pH) and the concentration of free glutathione (increasing thiol stabilizes the adduct) on the stability was observed, indicating a base-catalyzed mechanism of the degradation/formation of the thiocarbamate bond. Unlike the monoadduct, which forms almost exclusively the polyurea upon degradation, a variety of products were formed upon degradation of the his adduct. Though the disappearance of the his adduct was complete as measured by HPLC, H-1 NMR spectra showed the existence of residual thiocarbamate bonds in the final mixture. In both cases, no evidence of the free methylene-bis-phenylamine (MDA) could be detected under the applicable conditions.

  DOI：

  10.1021/tx0255020