octadecyl 2-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methyl-pentanoate

• 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: octadecyl 2-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methyl-pentanoate
• 英文别名: octadecyl (2S)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methylpentanoate
• 化学式: C₃₉H₅₉NO₄
• 分子量: 605.902
• InChiKey: YMOBDRMPVUWKIE-QNGWXLTQSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  13.5
• 重原子数：
  44
• 可旋转键数：
  25
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.64
• 拓扑面积：
  64.6
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  硬脂醇 、 Fmoc-Leu-OMe 在 titanium(IV) oxide bis(2,4-pentanedionate) 作用下， 以 甲苯 为溶剂， 反应 120.5h， 以86%的产率得到octadecyl 2-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methyl-pentanoate
  参考文献：
  名称：

  Nucleophilic Acyl Substitutions of Esters with Protic Nucleophiles Mediated by Amphoteric, Oxotitanium, and Vanadyl Species

  摘要：

  [GRAPHICS]A diverse array of oxometallic species were examined as catalysts in nucleophilic acyl substitution (NAS) reactions of methyl (or ethyl) esters with protic nucleophiles. Among them, oxotitanium acetylacetonate (TiO(acac)(2)) and vanadyl chloride (VOCl2-(THF)(x)) served as the most efficient and water-tolerant catalysts. Transesterifications of methyl and/or ethyl esters with functionalized (including acid- or base-sensitive) 1degrees and 2degrees alcohols can be carried out chemoselectively in refluxed toluene or xylene in a 1:1 substrate stoichiometry using 1 mol % catalyst loading. The resultant products were furnished in 85-100% yields by simple aqueous workup to remove water-soluble catalysts. The new NAS protocol is also amenable to amines and thiols in 74-91% yields, albeit with higher loading (2.5 equiv) of protic nucleophiles. Representative examples of commercial interests such as Padimate 0 and antioxidant additives for plastics were also examined to demonstrate their practical applications. A 1:1 adduct between TiO(acac)2 and a given 1-octadecanol was identified as (C18H37O)(2)Ti(acac)(2) and was responsible for its subsequent NAS of methyl esters.

  DOI：

  10.1021/jo0484878

文献信息

• Nucleophilic Acyl Substitutions of Esters with Protic Nucleophiles Mediated by Amphoteric, Oxotitanium, and Vanadyl Species
  作者：Chien-Tien Chen、Jen-Huang Kuo、Cheng-Hsiu Ku、Shiue-Shien Weng、Cheng-Yuan Liu

  DOI：10.1021/jo0484878

  日期：2005.2.1

  [GRAPHICS]A diverse array of oxometallic species were examined as catalysts in nucleophilic acyl substitution (NAS) reactions of methyl (or ethyl) esters with protic nucleophiles. Among them, oxotitanium acetylacetonate (TiO(acac)(2)) and vanadyl chloride (VOCl2-(THF)(x)) served as the most efficient and water-tolerant catalysts. Transesterifications of methyl and/or ethyl esters with functionalized (including acid- or base-sensitive) 1degrees and 2degrees alcohols can be carried out chemoselectively in refluxed toluene or xylene in a 1:1 substrate stoichiometry using 1 mol % catalyst loading. The resultant products were furnished in 85-100% yields by simple aqueous workup to remove water-soluble catalysts. The new NAS protocol is also amenable to amines and thiols in 74-91% yields, albeit with higher loading (2.5 equiv) of protic nucleophiles. Representative examples of commercial interests such as Padimate 0 and antioxidant additives for plastics were also examined to demonstrate their practical applications. A 1:1 adduct between TiO(acac)2 and a given 1-octadecanol was identified as (C18H37O)(2)Ti(acac)(2) and was responsible for its subsequent NAS of methyl esters.