(6R,7S,8R)-7,8-dibenzyloxy-6-hydroxy-5,6,7,8-tetrahydroimidazo[1,2-a]pyridine | 266688-24-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 咪唑并吡啶类
• 英文名称: (6R,7S,8R)-7,8-dibenzyloxy-6-hydroxy-5,6,7,8-tetrahydroimidazo[1,2-a]pyridine
• 英文别名: (6R,7S,8R)-7,8-bis(phenylmethoxy)-5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-6-ol
• CAS: 266688-24-8
• 化学式: C₂₁H₂₂N₂O₃
• 分子量: 350.417
• InChiKey: UNJHTFGJBAJIKS-AABGKKOBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.7
• 重原子数：
  26
• 可旋转键数：
  6
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.29
• 拓扑面积：
  56.5
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  (6R,7S,8R)-7,8-dibenzyloxy-6-hydroxy-5,6,7,8-tetrahydroimidazo[1,2-a]pyridine 在 palladium dihydroxide 氢气 、 溶剂黄146 作用下， 以 乙醇 为溶剂， 20.0 ℃ 、100.0 kPa 条件下， 反应 12.0h， 以89%的产率得到(6R,7S,8R)-5,6,7,8-Tetrahydro-imidazo[1,2-a]pyridine-6,7,8-triol
  参考文献：
  名称：

  Synthesis of Imidazolo-Piperidinopentoses as Nagstatine Analogues

  摘要：

  The syntheses of the four imidazolo-piperidino-pentoses 3-6, which belong to the D-series, and of their L-enantiomers, ent-3 to ent-6, are reported. Ascorbic acid and isoascorbic acid were converted over several steps into the L-threo/L-erythro- and the D-erythro/D-threo-configured aldotetroses, respectively, which are the key building blocks for the eight target imidazolo-pentoses cited above. Nucleophilic addition of a metallated imidazole to any one of these four aldotetroses gave the corresponding two diastereomeric adducts, intramolecular cyclisation of which provided the expected bicyclic target molecules, with some protection and deprotection steps being unavoidable prerequisites. The structures and configurations of all eight piperidinoses in Scheme 1 were determined unambiguously, by a combination of H-1/C-13 NMR spectroscopy, circular dichroism (CD) and MD values, in conjunction with single-crystal X-ray diffraction analyses of the L-arabino and D-lyxo azasugars ent-3 and 6. Although lacking the hydroxymethylene group in the C(5) position, the overall structure of these eight stereomers strongly resembles that of the natural product nagstatine (1), a potent inhibitor of N-acetyl-beta -D-glucosaminidase. As a matter of fact, after examination of the inhibitory properties of these imidazolo-piperidinoses against six commonly encountered glycosidases, we observe that the L-arabino imidazolo-sugar ent-3 is a potent inhibitor in this series, with K-i = 1 muM both with a beta -glucosidase and with a beta -galactosidase. The D-ribo and D-xylo stereomers 4 and 5 proved to be inhibitors of a beta -glucosidase of similar magnitude (4: K-i = 20 muM; 5: K-i = 17 muM), the other stereomers being either modest to poor inhibitors, or showing no inhibition at all.

  DOI：

  10.1002/1099-0690(200111)2001:21<4111::aid-ejoc4111>3.0.co;2-7
• 作为产物：
  描述：

  4-O-acetyl-5-amino-2,3-di-O-benzyl-5-deoxy-D-xylonothio-1,5-lactam 在 mercury(II) diacetate 、 对甲苯磺酸 作用下， 以 四氢呋喃 、 水 、 甲苯 为溶剂， 反应 18.75h， 生成 (6R,7S,8R)-7,8-dibenzyloxy-6-hydroxy-5,6,7,8-tetrahydroimidazo[1,2-a]pyridine
  参考文献：
  名称：

  木二糖衍生的氮糖对纳摩尔与毫摩尔的抑制作用：两种结构不同的木聚糖酶之间的显着差异

  摘要：

  描述了木二糖衍生的含氮木聚糖酶抑制剂的合成，从可获得的前体开始，通过有效的合成方案。四种双糖被鉴定为来自纤维单胞菌的保留家族 10 木聚糖酶 Cex 的强大竞争抑制剂，即咪唑 (Ki = 150 nM)、内酰胺肟 (Ki = 370 nM)、异发米 (Ki = 130 nM) 和脱氧野尻霉素 ( Ki = 5800 nM) 木二糖衍生物。相比之下，没有一种化合物在明显程度上抑制来自环状芽孢杆菌的家族 11 木聚糖酶 Bcx。对咪唑和内酰胺肟表现出的区别提供了两种可能的解释。一种解释与两种酶中酸/碱残基的不同活性位点位置有关：10 Cex 家族的 C1-O5 键和 11 Bcx 家族的 Syn 键。另一种解释涉及两种酶的过渡态构象的拟议差异：Cex 的半椅和 Bcx 的船。这...

  DOI：

  10.1021/ja993805j

文献信息

• Synthesis of Imidazolo-Piperidinopentoses as Nagstatine Analogues
  作者：François Gessier、Théophile Tschamber、Céline Tarnus、Markus Neuburger、Walter Huber、Jacques Streith

  DOI：10.1002/1099-0690(200111)2001:21<4111::aid-ejoc4111>3.0.co;2-7

  日期：2001.11

  The syntheses of the four imidazolo-piperidino-pentoses 3-6, which belong to the D-series, and of their L-enantiomers, ent-3 to ent-6, are reported. Ascorbic acid and isoascorbic acid were converted over several steps into the L-threo/L-erythro- and the D-erythro/D-threo-configured aldotetroses, respectively, which are the key building blocks for the eight target imidazolo-pentoses cited above. Nucleophilic addition of a metallated imidazole to any one of these four aldotetroses gave the corresponding two diastereomeric adducts, intramolecular cyclisation of which provided the expected bicyclic target molecules, with some protection and deprotection steps being unavoidable prerequisites. The structures and configurations of all eight piperidinoses in Scheme 1 were determined unambiguously, by a combination of H-1/C-13 NMR spectroscopy, circular dichroism (CD) and MD values, in conjunction with single-crystal X-ray diffraction analyses of the L-arabino and D-lyxo azasugars ent-3 and 6. Although lacking the hydroxymethylene group in the C(5) position, the overall structure of these eight stereomers strongly resembles that of the natural product nagstatine (1), a potent inhibitor of N-acetyl-beta -D-glucosaminidase. As a matter of fact, after examination of the inhibitory properties of these imidazolo-piperidinoses against six commonly encountered glycosidases, we observe that the L-arabino imidazolo-sugar ent-3 is a potent inhibitor in this series, with K-i = 1 muM both with a beta -glucosidase and with a beta -galactosidase. The D-ribo and D-xylo stereomers 4 and 5 proved to be inhibitors of a beta -glucosidase of similar magnitude (4: K-i = 20 muM; 5: K-i = 17 muM), the other stereomers being either modest to poor inhibitors, or showing no inhibition at all.
• Nanomolar versus Millimolar Inhibition by Xylobiose-Derived Azasugars:  Significant Differences between Two Structurally Distinct Xylanases
  作者：Spencer J. Williams、Roland Hoos、Stephen G. Withers

  DOI：10.1021/ja993805j

  日期：2000.3.1

  deoxynojirimycin (Ki = 5800 nM) derivatives of xylobiose. By contrast, none of the compounds inhibited the family 11 xylanase, Bcx, from Bacillus circulans, to an appreciable extent. Two possible explanations are provided for the discrimination exhibited by the imidazole and the lactam oxime. One explanation relates to the different active site locations of the acid/base residue in the two enzymes: anti to

  描述了木二糖衍生的含氮木聚糖酶抑制剂的合成，从可获得的前体开始，通过有效的合成方案。四种双糖被鉴定为来自纤维单胞菌的保留家族 10 木聚糖酶 Cex 的强大竞争抑制剂，即咪唑 (Ki = 150 nM)、内酰胺肟 (Ki = 370 nM)、异发米 (Ki = 130 nM) 和脱氧野尻霉素 ( Ki = 5800 nM) 木二糖衍生物。相比之下，没有一种化合物在明显程度上抑制来自环状芽孢杆菌的家族 11 木聚糖酶 Bcx。对咪唑和内酰胺肟表现出的区别提供了两种可能的解释。一种解释与两种酶中酸/碱残基的不同活性位点位置有关：10 Cex 家族的 C1-O5 键和 11 Bcx 家族的 Syn 键。另一种解释涉及两种酶的过渡态构象的拟议差异：Cex 的半椅和 Bcx 的船。这...