4,6-Dichlor-benzimidazolon | 39513-29-6

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并咪唑类
• 英文名称: 4,6-Dichlor-benzimidazolon
• 英文别名: 4,6-Dichlorobenzimidazolin-2-one；4,6-dichloro-1,3-dihydrobenzimidazol-2-one
• CAS: 39513-29-6
• 化学式: C₇H₄Cl₂N₂O
• 分子量: 203.028
• InChiKey: IQVUIJYEKLITAF-UHFFFAOYSA-N

物化性质

• 熔点：
  340 °C(Solv: ethanol (64-17-5))
• 沸点：
  189.7±33.0 °C(Predicted)
• 密度：
  1.549±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.8
• 重原子数：
  12
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  41.1
• 氢给体数：
  2
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  4,6-Dichlor-benzimidazolon 在 potassium carbonate 作用下， 以 乙腈 为溶剂， 反应 1.0h， 生成 Ethyl 3-benzyl-4,6-dichloro-2-oxobenzimidazole-1-carboxylate
  参考文献：
  名称：

  Regiospecific Functionalization of 1,3-Dihydro-2H-benzimidazol-2-one and Structurally Related Cyclic Urea Derivatives

  摘要：

  Methods for selectively protecting one of the degenerate nitrogen atoms of the cyclic urea derivatives 1,3-dihydro-2H-benzimidazol-2-one (6a), 1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-one (11), 1,3-dihydro-2H-imidazo[4,5-b]quinolin-2-ones (20), 1,3-dihydro-2H-imidazo[4,5-c]pyridin-2-one (22), and 1,3-dihydro-4-phenyl-2H-imidazol-2-one (27) were developed. Heating these cyclic ureas with ethyl 2-pyridyl carbonate in the presence of a base in CH3CN at reflux or DMF at 100 degrees C cleanly provided the monoethoxycarbonyl derivatives 7a, 12, 21, 23, and 28, respectively. Alternatively, treatment of 6a with an excess of diethyl pyrocarbonate or di-tert-butyl dicarbonate afforded the bis-alkoxycarbonyl derivatives 8a and 8b, respectively, which underwent disproportionation to 7a and 7b upon heating with 1 mol equiv of 6a and K2CO3 in CH3CN at reflux. The regiochemistry of the introduction of alkoxycarbonyl groups to benzimidazol-2-one derivatives was not significantly influenced by an electron-withdrawing (CF3, 6b) or an electron-donating (OCH3, 6c) substituent at C-5 of the heterocyclic ring. However, the reaction was found to be sensitive to steric factors since a chlorine substituent ortho to one of the urea N atoms (6e) completely directed the alkoxycarbonyl moiety to the less sterically encumbered N atom, affording a single product (7f, 7g). Alkylation of 7a-g proceeded efficiently to provide products 10a-10ag after removal of the protecting group. Halogenation of monoprotected benzimidazol-2-one 7a occurred regiospecifically to give the monohalo derivatives 7h, 7i, and 7k, the identity of which were readily established from the characteristic chemical shift and spin coupling pattern in their 1H NMR spectra. A protecting group interchange strategy that took advantage of the distinctive chemical reactivities of the EtO(2)C and t-BuO(2)C protecting groups toward isopropylamine was developed that provided access to the isomerically substituted series of monohalo, mono-N-alkylated benzimidazol-2-ones 71 and 7m. The efficient derivatization of the unprotected N atom of these monoprotected cyclic urea derivatives was accomplished by treating with activated and unactivated halides in the. presence of K2CO3 or exposure to alcohols under Mitsunobu conditions. In several cases, mixtures of O- and N-alkylated products were produced which were readily separated by chromatography. Alkylation of 7h with activated halides, using K2CO3 in CH3CN at reflux, occurred without protecting group equilibration; however, a mixture of isomeric alkylated products was obtained when 7h was heated at 110 degrees C in DMF with cyclohexylmethyl bromide in the presence of K2CO3 as the base. Derivatization of 7h under Mitsunobu reaction conditions proceeded with retention of the topological substituent relationships. Subsequent removal of the alkoxycarbonyl moiety afforded monoalkylated cyclic urea derivatives.

  DOI：

  10.1021/jo00111a014
• 作为产物：
  描述：

  2-氨基-3,5-二氯苯甲酸 在 二苯基磷酸 、 三乙胺 作用下， 以 甲苯 为溶剂， 以75%的产率得到4,6-Dichlor-benzimidazolon
  参考文献：
  名称：

  Regiospecific Functionalization of 1,3-Dihydro-2H-benzimidazol-2-one and Structurally Related Cyclic Urea Derivatives

  摘要：

  Methods for selectively protecting one of the degenerate nitrogen atoms of the cyclic urea derivatives 1,3-dihydro-2H-benzimidazol-2-one (6a), 1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-one (11), 1,3-dihydro-2H-imidazo[4,5-b]quinolin-2-ones (20), 1,3-dihydro-2H-imidazo[4,5-c]pyridin-2-one (22), and 1,3-dihydro-4-phenyl-2H-imidazol-2-one (27) were developed. Heating these cyclic ureas with ethyl 2-pyridyl carbonate in the presence of a base in CH3CN at reflux or DMF at 100 degrees C cleanly provided the monoethoxycarbonyl derivatives 7a, 12, 21, 23, and 28, respectively. Alternatively, treatment of 6a with an excess of diethyl pyrocarbonate or di-tert-butyl dicarbonate afforded the bis-alkoxycarbonyl derivatives 8a and 8b, respectively, which underwent disproportionation to 7a and 7b upon heating with 1 mol equiv of 6a and K2CO3 in CH3CN at reflux. The regiochemistry of the introduction of alkoxycarbonyl groups to benzimidazol-2-one derivatives was not significantly influenced by an electron-withdrawing (CF3, 6b) or an electron-donating (OCH3, 6c) substituent at C-5 of the heterocyclic ring. However, the reaction was found to be sensitive to steric factors since a chlorine substituent ortho to one of the urea N atoms (6e) completely directed the alkoxycarbonyl moiety to the less sterically encumbered N atom, affording a single product (7f, 7g). Alkylation of 7a-g proceeded efficiently to provide products 10a-10ag after removal of the protecting group. Halogenation of monoprotected benzimidazol-2-one 7a occurred regiospecifically to give the monohalo derivatives 7h, 7i, and 7k, the identity of which were readily established from the characteristic chemical shift and spin coupling pattern in their 1H NMR spectra. A protecting group interchange strategy that took advantage of the distinctive chemical reactivities of the EtO(2)C and t-BuO(2)C protecting groups toward isopropylamine was developed that provided access to the isomerically substituted series of monohalo, mono-N-alkylated benzimidazol-2-ones 71 and 7m. The efficient derivatization of the unprotected N atom of these monoprotected cyclic urea derivatives was accomplished by treating with activated and unactivated halides in the. presence of K2CO3 or exposure to alcohols under Mitsunobu conditions. In several cases, mixtures of O- and N-alkylated products were produced which were readily separated by chromatography. Alkylation of 7h with activated halides, using K2CO3 in CH3CN at reflux, occurred without protecting group equilibration; however, a mixture of isomeric alkylated products was obtained when 7h was heated at 110 degrees C in DMF with cyclohexylmethyl bromide in the presence of K2CO3 as the base. Derivatization of 7h under Mitsunobu reaction conditions proceeded with retention of the topological substituent relationships. Subsequent removal of the alkoxycarbonyl moiety afforded monoalkylated cyclic urea derivatives.

  DOI：

  10.1021/jo00111a014

文献信息

• Rational Design, Pharmacomodulation, and Synthesis of Dual 5-Hydroxytryptamine 7 (5-HT₇)/5-Hydroxytryptamine 2A (5-HT_2A) Receptor Antagonists and Evaluation by [¹⁸F]-PET Imaging in a Primate Brain
  作者：Emmanuel Deau、Elodie Robin、Raluca Voinea、Nathalie Percina、Grzegorz Satała、Adriana-Luminita Finaru、Agnès Chartier、Gilles Tamagnan、David Alagille、Andrzej J. Bojarski、Séverine Morisset-Lopez、Franck Suzenet、Gérald Guillaumet

  DOI：10.1021/acs.jmedchem.5b00874

  日期：2015.10.22

  We report the synthesis of 46 tertiary amine-bearing N-alkylated benzo[d]imidazol-2(3H)-ones, imidazo[4,5-b]pyridin-2(3H)-ones, imidazo[4,5-c]pyridin-2(3H)-ones, benzo[d]oxazol-2(3H)-ones, oxazolo[4,5-b]pyridin-2(3H)-ones and N,N′-dialkylated benzo[d]imidazol-2(3H)-ones. These compounds were evaluated against 5-HT7R, 5-HT2AR, 5-HT1AR, and 5-HT6R as potent dual 5-HT7/5-HT2A serotonin receptors ligands

  我们报告了46个含叔胺的N-烷基化苯并[ d ]咪唑-2（3 H）-ones，咪唑并[4,5 - b ]吡啶-2（3 H）-ones，咪唑并[4,5 ]的合成- ç ]吡啶-2（3 H ^） -酮，苯并[ d ]唑-2（3 H ^） -酮，恶唑并[4,5- b ]吡啶-2（3 H ^） -酮和ñ，ñ ' -二烷基化的苯并[ d ]咪唑-2（3 H）-ones。针对5-HT 7 R，5-HT 2A R，5-HT 1A R和5-HT 6评估了这些化合物R为有效的双重5-HT 7 / 5-HT 2A血清素受体配体。对芳香环及其取代基，烷基链长和叔胺的结构-活性关系进行了彻底的研究。1-（4-（4-（4-氟苯甲酰基）哌啶-1-基）丁基）-1 H-苯并[ d ]咪唑-2（3 H）-一（79）和1-（6-（4- （4-氟苯甲酰基）哌啶-1-基己基）-1 H-苯并[ d ]咪唑-2（3 H）-一（81）
• Antimalarial Benzimidazole Derivatives Incorporating Phenolic Mannich Base Side Chains Inhibit Microtubule and Hemozoin Formation: Structure–Activity Relationship and <i>In Vivo</i> Oral Efficacy Studies
  作者：Godwin Akpeko Dziwornu、Dina Coertzen、Meta Leshabane、Constance M. Korkor、Cleavon K. Cloete、Mathew Njoroge、Liezl Gibhard、Nina Lawrence、Janette Reader、Mariëtte van der Watt、Sergio Wittlin、Lyn-Marie Birkholtz、Kelly Chibale

  DOI：10.1021/acs.jmedchem.1c00354

  日期：2021.4.22

  A novel series of antimalarial benzimidazole derivatives incorporating phenolic Mannich base side chains at the C2 position, which possess dual asexual blood and sexual stage activities, is presented. Structure–activity relationship studies revealed that the 1-benzylbenzimidazole analogues possessed submicromolar asexual blood and sexual stage activities in contrast to the 1H-benzimidazole analogues

  提出了一系列新的抗疟疾苯并咪唑衍生物，该衍生物在C2位上结合了酚类曼尼希碱侧链，具有无性血液和有性的双重活动。结构与活性之间的关系研究表明，与1 H-苯并咪唑类似物相比，1-苄基苯并咪唑类似物具有亚微摩尔无性血液和性阶段活动，而1 H-苯并咪唑类似物仅对无性血液阶段（ABS）寄生虫具有活性。此外，前者在ABS寄生虫中表现出微管抑制活性，但在II / III期配子细胞中表现出更显着的抑制作用。1 H-苯并咪唑类似物除了是血红蛋白形成的真正抑制剂外，还显示出对微管的抑制作用。体内对伯氏疟原虫感染的小鼠进行的功效研究表明，当以4×50 mg / kg口服给药时，领先的化合物41表现出很高的功效（寄生虫血症减少98％）。通常，该化合物对哺乳动物细胞无细胞毒性。
• Synthesis of Some Substituted Benzoxazolones
  作者：Robert L. Clark、Arsenio A. Pessolano

  DOI：10.1021/ja01540a038

  日期：1958.4
• Design, syntheses, and structure–activity relationships of novel NPY Y5 receptor antagonists: 2-{3-Oxospiro[isobenzofuran-1(3H),4′-piperidin]-1′-yl}benzimidazole derivatives
  作者：Yoshio Ogino、Norikazu Ohtake、Yoshikazu Nagae、Kenji Matsuda、Minoru Moriya、Takuya Suga、Makoto Ishikawa、Maki Kanesaka、Yuko Mitobe、Junko Ito、Tetsuya Kanno、Akane Ishihara、Hisashi Iwaasa、Tomoyuki Ohe、Akio Kanatani、Takehiro Fukami

  DOI：10.1016/j.bmcl.2008.08.018

  日期：2008.9

  Design, syntheses, and structure-activity relationships of a novel class of 2-3-oxospiro[isobenzofuran-1(3H),4'-piperidin]-1'-yl}benzimidazole NPY Y5 receptor antagonists are described. The benzimidazole structures were newly designed based on the urea linkage of our prototype Y5 receptor antagonists (2 and 3). By optimizing substituents on the benzimidazole core part of the lead compound 5a, we were able to develop a potent, orally available, and brain-penetrable Y5 selective antagonist (5k). Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
• Facile synthesis of benzimidazol-2-one derivatives by modified Lossen rearrangement
  作者：Zygmunt Eckstein、Tadeusz Jadach、Ewa Lipczynska-Kochany

  DOI：10.1021/je00032a042

  日期：1983.4