2,3,4,6-tetra-O-benzyl-5a-carba-β-D-galactopyranose | 924298-42-0

• 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: 2,3,4,6-tetra-O-benzyl-5a-carba-β-D-galactopyranose
• 英文别名: (1R,2S,3S,4S,5R)-2,3,4-tris(benzyloxy)-5-(benzyloxymethyl)cyclohexanol
• CAS: 924298-42-0
• 化学式: C₃₅H₃₈O₅
• 分子量: 538.684
• InChiKey: NJRAMLDONBHEDS-VABIIVNOSA-N

物化性质

• 沸点：
  654.9±55.0 °C(Predicted)
• 密度：
  1.19±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  6.34
• 重原子数：
  40.0
• 可旋转键数：
  13.0
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.31
• 拓扑面积：
  57.15
• 氢给体数：
  1.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  2,3,4,6-tetra-O-benzyl-5a-carba-β-D-galactopyranose 在 lithium aluminium tetrahydride 、 sodium azide 、 caesium carbonate 、 苯硫酚 、 盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 、 三乙胺 作用下， 以 四氢呋喃 、 N,N-二甲基甲酰胺 、 乙腈 为溶剂， 反应 42.0h， 生成 N-((S)-1-((4S,5R)-2,2-dimethyl-5-tetradecyl-1,3-dioxolan-4-yl)-2-((1S,2S,3S,4S,5R)-2,3,4-tris(benzyloxy)-5-(benzyloxymethyl)cyclohexylamino)ethyl)cerotamide
  参考文献：
  名称：

  Galacto-Configured Aminocyclitol Phytoceramides Are Potent in Vivo Invariant Natural Killer T Cell Stimulators

  摘要：

  A new class of a-galactosylceramide (alpha GC) nonglycosidic analogues bearing galacto-configured aminocyclitols as sugar surrogates have been obtained. The aminocyclohexane having a hydroxyl substitution pattern similar to an a-galactoside is efficiently obtained by a sequence involving Evans aldol reaction and ring-closing metathesis with a Grubbs catalyst to give a key intermediate cyclohexene, which has been converted in galacto-aminocyclohexanes that are linked through a secondary amine to a phytoceramide lipid having a cerotyl N-acyl group. Natural Killer T (NKT) cellular assays have resulted in the identification of an active compound, HS161, which has been found to promote NKT cell expansion in vitro in a similar fashion but more weakly than alpha GC. This compound stimulates the release of Interferon-gamma (IFN gamma) and Interleukin-4 (IL-4) in iNKT cell culture but with lower potency than alpha GC. The activation of Invariant Natural Killer T (iNKT) cells by this compound has been confirmed in flow cytometry experiments. Remarkably, when tested in mice, HS161 selectively induces a very strong production of IFN-gamma indicative of a potent Th1 cytokine profile. Overall, these data confirm the agonist activity of alpha GC lipid analogues having charged amino-substituted polar heads and their capacity to modulate the response arising from iNKT cell activation in vivo.

  DOI：

  10.1021/ja202610x
• 作为产物：
  描述：

  (1R,2S,5S)-5-(tert-butyl-diphenylsilanyloxymethyl)-1-methoxymethoxy-2-benzyloxy-cyclohex-3-ene 在 盐酸 、 四氧化锇 、 四丁基氟化铵 、 水 、 sodium hydride 、 N-甲基吗啉氧化物 作用下， 以 四氢呋喃 、 甲醇 、 水 、 丙酮 为溶剂， 反应 60.42h， 生成 2,3,4,6-tetra-O-benzyl-5a-carba-β-D-galactopyranose
  参考文献：
  名称：

  Practical syntheses of optically active carbagalactose and their potential application to the carbocyclic analogues of KRN7000

  摘要：

  Carba-alpha- and beta-D-galactose derivatives were efficiently prepared from a cyclohex-3-ene-1,2-diol derivative 1. Regioselective inversion of 2-OH, and stereoselective dihydroxylation of I were accomplished to provide a carba-p-D-galactose derivative 6 in a good yield and with a high stereoselectivity. Stereo-inversion of 1-OH of 6 via oxidation/reduction gave carba-beta-D-galactose derivative 12 with a high stereoselectivity. An efficient coupling of carba-alpha-galactose 12 with an aziridine derivative of sphingosine has been demonstrated to give 1-O-carba-alpha-galactosyl sphingosine derivative 14. (c) 2006 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetasy.2006.11.014