4-iodo-3-isopropoxy-5-(1-methoxycarbonyl-4-piperidyl)isoxazole | 439944-76-0

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 哌啶类
• 英文名称: 4-iodo-3-isopropoxy-5-(1-methoxycarbonyl-4-piperidyl)isoxazole
• 英文别名: Methyl 4-(4-iodo-3-propan-2-yloxy-1,2-oxazol-5-yl)piperidine-1-carboxylate
• CAS: 439944-76-0
• 化学式: C₁₃H₁₉IN₂O₄
• 分子量: 394.209
• InChiKey: GRXVWFWYEFAYIY-UHFFFAOYSA-N

物化性质

• 熔点：
  118-120 °C
• 沸点：
  437.2±45.0 °C(Predicted)
• 密度：
  1.547±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.6
• 重原子数：
  20
• 可旋转键数：
  4
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.69
• 拓扑面积：
  64.8
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  4-iodo-3-isopropoxy-5-(1-methoxycarbonyl-4-piperidyl)isoxazole 在 三乙基硅烷 、 乙基氯化镁 、 三氟乙酸 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 21.0h， 生成 4-(cyclohexylmethyl)-3-isopropoxy-5-(1-methoxycarbonyl-4-piperidyl)isoxazole
  参考文献：
  名称：

  Novel Class of Potent 4-Arylalkyl Substituted 3-Isoxazolol GABA_A Antagonists:  Synthesis, Pharmacology, and Molecular Modeling

  摘要：

  A number of analogues of the low-efficacy partial GABA(A) agonist 5-(4-piperidyl)-3-isoxazolol (4-PIOL, 5), in which the 4-position of the 3-isoxazolol ring was substituted by different groups, were synthesized and tested as GABA(A) receptor ligands. Substituents of different size and structural flexibility such as alkyl, phenylalkyl, diphenylalkyl, and naphthylalkyl were explored. Pharmacological characterization of the synthesized compounds was carried out using receptor binding assays and by electrophysiological experiments using whole-cell patch-clamp techniques. Whereas none of these compounds significantly affected GABA(B) receptor sites or GABA uptake, they did show affinity for the GABA(A) receptor site. While alkyl or benzyl substitution, compounds 7a-h, provided receptor affinities comparable with that of 5 (K-i = 9.1 muM), diphenylalkyl and naphthylalkyl substitution, as in compounds 7m-t, resulted in a dramatic increase in affinity relative to 5. The 3,3-diphenylpropyl and the 2-naphthylmethyl analogues, compounds 7s and 7m, respectively, showed the highest affinities of the series (K-i = 0.074 muM and K-i = 0.049 muM). In whole-cell patch-clamp recordings from cultured cerebral cortical neurons, all of the tested compounds were able to inhibit the effect of the specific GABA(A) agonist isoguvacine (1), compounds 7m and 7s showing antagonist potency (IC50 = 0.37 muM and IC50 = 0.02 muM) comparable with or markedly higher than that of the standard GABA(A) antagonist 4 (IC50 = 0.24 muM). Highly potent convulsant activity was demonstrated in mice with compounds 7m (ED50 = 0.024 mumol/kg) and 7s (ED50 = 0.21 mumol/kg) after intracerebroventricular administration, whereas no effects were found after subcutaneous administration. According to a previously proposed pharmacophore model for GABA(A) receptor agonists, a receptor cavity in the vicinity of the 4-position of the 3-isoxazolol ring in 4-PIOL exists. A molecular modeling study, based on compounds 7o,m,l,q,s, was performed to explore the dimensions and other properties of the receptor cavity. This study demonstrates the importance of the arylalkyl substituents in 7m and 7s and the considerable dimensions of this proposed receptor cavity.

  DOI：

  10.1021/jm020027o
• 作为产物：
  描述：

  3-isopropoxy-5-(1-methoxycarbonyl-4-piperidyl)isoxazole 在 一氯化碘 、 溶剂黄146 作用下， 反应 21.0h， 生成 4-iodo-3-isopropoxy-5-(1-methoxycarbonyl-4-piperidyl)isoxazole
  参考文献：
  名称：

  Potent 4-Aryl- or 4-Arylalkyl-Substituted 3-Isoxazolol GABA_A Antagonists:  Synthesis, Pharmacology, and Molecular Modeling

  摘要：

  We have previously described a series of competitive GABA(A) antagonists derived from the low-efficacy partial agonist 5-(4-piperidyl)-3-isoxazolol (4-PIOL, 4). The 2-naphthylmethyl analogue, 4-(2-naphthylmethyl)-5-(4-piperidyl)-3-isoxazolol (5), provided affinity for the GABA(A) receptor site higher than that of the standard GABA(A) receptor antagonist, SR 95531 (3). Molecular modeling studies of these compounds exposed a cavity at the receptor recognition site capable of accommodating aromatic groups of substantial size in the 4-position in the 3-isoxazolol ring, Here we present a series of analogues of 5, with various substituents in different positions in the naphthyl ring system (6a-k), and compounds with aromatic substituents directly attached to the 4-position of the 3-isoxazolol ring (7l-n). The compounds have been pharmacologically characterized using receptor-binding assays and electrophysiological whole-cell patch-clamp techniques. All of the tested compounds show affinity for the GABA(A) receptor site. While the 5-, 7-, and 8-bromo analogues, 6b-d, showed receptor affinities (K-i = 45, 109, and 80 nM, respectively) comparable with that of 5 (Ki 49 nM), the 1-bromo analogue, 6a, provided the highest receptor affinity of the series (Ki 10 nM). Introduction of a series of different substituents in the 1-position in the 2-naphthyl ring system led to compounds. 6,e-k. with retained high affinity for the GABA(A) receptor (K-i = 16-250 nM). Introduction of a phenyl ring directly into the 4-position on the 3-isoxazolol ring gave a 41-fold increase in affinity relative to that of 4-PIOL. In whole-cell patch-clamp recordings from cultured cerebral cortical neurons. all of the tested compounds were able to inhibit the effect of the Specific GABA(A) agonist, isoguvacine, 6a showing antagonist potency (IC50 = 42 nM) markedly higher than that, of 3 (IC50 = 240 nM). Molecular modeling studies, based on the compounds described, emphasized the importance of the distal ring in 5 for receptor affinity and the considerable dimensions of the proposed receptor cavity. Furthermore, the phenyl rings in 71 and in 6k were shown to represent highly favorable positions for an aromatic ring in previously unexplored receptor regions in terms of a pharmacophore model.

  DOI：

  10.1021/jm049256w

文献信息

• Developing New 4-PIOL and 4-PHP Analogues for Photoinactivation of γ-Aminobutyric Acid Type A Receptors
  作者：Martin Mortensen、Jacob Krall、Kenneth T. Kongstad、Benjamin M. Brygger、Ombretta Lenzi、Pierre Francotte、Troels E. Sørensen、Birgitte Nielsen、Anders A. Jensen、Trevor G. Smart、Bente Frølund

  DOI：10.1021/acschemneuro.9b00478

  日期：2019.11.20

  It is therefore crucial to develop novel technologies and especially chemical entities that can interrogate GABAA receptor function in the nervous system. Here, we describe the chemistry and characterization of a novel set of 4-PIOL and 4-PHP analogues synthesized with the aim of developing a toolkit of drugs that can photoinactivate GABAA receptors. Most of these new analogues show higher affinities/potencies

  GABA A受体作为中枢神经系统兴奋的抑制调节剂发挥的关键作用已为人所知多年。异常的 GABA A受体功能和运输缺陷也与多种疾病有关，包括焦虑、抑郁、癫痫和失眠。因此，重要的药物组如苯二氮卓类药物、巴比妥类药物和许多全身麻醉剂已成为 GABA A受体活性的调节剂。然而，对于 GABA A受体在神经网络和系统水平上的作用和机制，我们还有很多不了解的地方。因此，至关重要的是开发新技术，尤其是可以询问 GABA 的化学实体神经系统中的受体功能。在这里，我们描述了一组新的 4-PIOL 和 4-PHP 类似物的化学性质和表征，目的是开发一种可以光灭活 GABA A 受体的药物工具包。与各自的先导化合物相比，这些新类似物中的大多数显示出更高的亲和力/效力。这表明它们的结合位点附近存在海绵状区域，这可能与新的受体相互作用有关。4-PHP 叠氮化物类似物，2d ，具有特别令人印象深刻的纳摩尔亲和力/效力，是一种有效的