caesium palmitate | 14912-92-6

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: caesium palmitate
• 英文别名: Cesium palmitate；Caesiumpalmitat；cesium;hexadecanoate
• CAS: 14912-92-6
• 化学式: C₁₆H₃₁O₂*Cs
• 分子量: 388.326
• InChiKey: XXJVRVRVOQTORH-UHFFFAOYSA-M

计算性质

• 辛醇/水分配系数(LogP)：
  1.22
• 重原子数：
  19
• 可旋转键数：
  14
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.94
• 拓扑面积：
  40.1
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  caesium palmitate 在 吡啶 、 4-二甲氨基吡啶 、 四溴化碳 、 20 % Pd(OH)2/C 、 氢气 、 溶剂黄146 、 三苯基膦 、 三氟乙酸 作用下， 以 甲醇 、 二氯甲烷 、 环己烷 、 N,N-二甲基甲酰胺 为溶剂， 20.0 ℃ 、101.33 kPa 条件下， 反应 37.0h， 生成 3-O-(6-O-palmitoyl-α-D-glucopyranosyl)-1,2-di-O-palmitoyl-sn-glycerol
  参考文献：
  名称：

  An easy α-glycosylation methodology for the synthesis and stereochemistry of mycoplasma α-glycolipid antigens

  摘要：

  Mycoplasma fermentans在细胞膜上具有独特的α-糖脂抗原（GGPL-I和GGPL-III），其中在糖原位（6-OH）位置携带磷胆碱基团。本文描述了一种实用的合成路径，用于合成GGPL-I同分异构体（C_16:0）及其对映异构体，其中我们有效地应用了一锅法α-糖基化方法。合成的GGPL-I同分异构体通过¹H NMR光谱表征，以确定在无环甘油部分的三种构象（gg、gt、tg）之间的平衡。发现天然的GGPL-I同分异构体在脂肪尾部周围更倾向于gt（54%）和gg（39%）构象，而在糖位周围则以相等的概率采用所有三种构象。这种特性与我们观察到的磷脂酰胆碱（DPPC）构象非常接近，表明Mycoplasma的糖脂GGPLs可能与普遍存在的磷脂一起构成细胞质膜，而不会引起立体化学应力。

  DOI：

  10.3762/bjoc.8.70
• 作为试剂：
  描述：

  丙酮缩甘油 在 N-甲基咪唑 、 四丁基碘化铵 、 caesium palmitate 、 sodium sulfate 、 三乙胺 、 2,6-二氯苯甲酰氯 作用下， 以 四氢呋喃 、 二氯甲烷 、 二甲基亚砜 、 N,N-二甲基甲酰胺 、 甲苯 为溶剂， 反应 162.5h， 生成 1,2-dipalmitoyl-sn-glycero-3-[(2′,3′-isopropylidene-rac-glycero)-1′-benzylphosphate]
  参考文献：
  名称：

  磷脂酰甘油的灵活合成方法

  摘要：

  报告了灵活的5步序列，可以合成在sn -1和sn -2位置带有不同或相同链的磷脂酰甘油。

  DOI：

  10.1002/ejoc.201701178

文献信息

• An easy α-glycosylation methodology for the synthesis and stereochemistry of mycoplasma α-glycolipid antigens
  作者：Yoshihiro Nishida、Yuko Shingu、Yuan Mengfei、Kazuo Fukuda、Hirofumi Dohi、Sachie Matsuda、Kazuhiro Matsuda

  DOI：10.3762/bjoc.8.70

  日期：——

  Mycoplasma fermentans possesses unique α-glycolipid antigens (GGPL-I and GGPL-III) at the cytoplasm membrane, which carry a phosphocholine group at the sugar primary (6-OH) position. This paper describes a practical synthetic pathway to a GGPL-I homologue (C_16:0) and its diastereomer, in which our one-pot α-glycosylation method was effectively applied. The synthetic GGPL-I isomers were characterized with ¹H NMR spectroscopy to determine the equilibrium among the three conformers (gg, gt, tg) at the acyclic glycerol moiety. The natural GGPL-I isomer was found to prefer gt (54%) and gg (39%) conformers around the lipid tail, while adopting all of the three conformers with equal probability around the sugar position. This property was very close to what we have observed with respect to the conformation of phosphatidylcholine (DPPC), suggesting that the Mycoplasma glycolipids GGPLs may constitute the cytoplasm fluid membrane together with ubiquitous phospholipids, without inducing stereochemical stress.

  Mycoplasma fermentans在细胞膜上具有独特的α-糖脂抗原（GGPL-I和GGPL-III），其中在糖原位（6-OH）位置携带磷胆碱基团。本文描述了一种实用的合成路径，用于合成GGPL-I同分异构体（C_16:0）及其对映异构体，其中我们有效地应用了一锅法α-糖基化方法。合成的GGPL-I同分异构体通过¹H NMR光谱表征，以确定在无环甘油部分的三种构象（gg、gt、tg）之间的平衡。发现天然的GGPL-I同分异构体在脂肪尾部周围更倾向于gt（54%）和gg（39%）构象，而在糖位周围则以相等的概率采用所有三种构象。这种特性与我们观察到的磷脂酰胆碱（DPPC）构象非常接近，表明Mycoplasma的糖脂GGPLs可能与普遍存在的磷脂一起构成细胞质膜，而不会引起立体化学应力。
• A Rapid Condensation between Lysophosphorylcholine and Fatty Acids with an Easily Separable Amine Base
  作者：Yuichi Kobayashi、Hukum P. Acharya

  DOI：10.1055/s-2005-871973

  日期：——

  With 2,6-Cl2C6H3COCl and 1-methylimidazole, the title condensation completed at room temperature within 12 hours, which is shorter time than that with the standard DCC/DMAP system. Use of easily separable 1-methylimidazole from the crude product by chromatography is an additional advantage of the present reagent system.

  以2，6-Cl2C6H3COCl和1-甲基咪唑为原料，标题缩合反应在室温下12小时内完成，时间短于标准DCC/DMAP体系。通过色谱法容易地从粗产物中分离出1-甲基咪唑，是本试剂体系的额外优势。
• Lipase-catalyzed enantioselective esterification or hydrolysis of 1-O-alkyl-3-O-tosylglycerol derivatives. Practical synthesis of (S)-(+)-1-O-hexadecyl-2,3-di-O-hexadecanoylglycerol, a marine natural product
  作者：Robert Chenevert、Rene Gagnon

  DOI：10.1021/jo00057a015

  日期：1993.2

  Racemic 1-O-alkyl-3-O-tosylglycerol derivatives were resolved by acylation with palmitic anhydride in the presence of Pseudomonas fluorescens lipase in organic media. The reverse reaction, the enzymatic hydrolysis of 1-O-alkyl-2-O-palmitoyl-3-O-tosylglycerols in isopropyl ether saturated with water was also highly stereoselective. An efficient and simple synthesis of the naturally occurring (S)-(+)-1-O-hexadecyl-2,3-di-O-hexadecanoylglycerol based on this process is reported.
• Efficient Synthesis of Phospholipids from Glycidyl Phosphates
  作者：Jan Lindberg、Johan Ekeroth、Peter Konradsson

  DOI：10.1021/jo010734+

  日期：2002.1.1

  New efficient routes to enantiopure phospholipids, starting from (S)-glycidol, are described. Lysophosphatidic acids and phosphatidic acids were obtained in good overall yields from (S)-glycidol, in only three and four steps, respectively. Moreover, the strategy can also be used to produce phosphatidylcholines in three steps. Using dialkylphosphoramidites, (S)-glycidol was phosphorylated to give (R)-1-O-glycidyl dialkyl phosphates. Regiospecific epoxide opening, using hexadecanol or cesium palmitate, followed by phosphate deprotection, provided lysophosphatidic acids. 2-O-Esterification prior to phosphate deprotection provided 1,2-O-diacyl and 1-O-alkyl-2-O-acyl phosphatidic acids. Phosphorylation of (S)-glycidol using phosphorus oxychloride followed by in situ treatment with choline tosylate produced (R)-glycidyl phosphocholine. Subsequent nucleophilic opening of the epoxide using cesium palmitate produced 1-O-palmitoyl-sn-glycero-3-phosphocholine, which has been used in syntheses of phosphatidylcholines.
• Efficient Syntheses of Pure Mixed Triglycerides
  作者：Jean-Louis Gras、Jean-François Bonfanti

  DOI：10.1080/00397910008087042

  日期：2000.12

  Pure mixed triglycerides can be prepared from diglycerides and by acylolysis of glycerolformal tosylate without isomerization. The last fatty chain, with or without a functional group, can be introduced on any position of glycerol.