本文介绍了属于N-取代-苯基咪唑基-4-酰基hydr类(3a-o)的新型N-杂环官能化N-酰基hydr化合物(NAH)的设计,合成和药理学评估的最新结果。通过应用分子杂交策略对这些化合物进行规划,以提出对上述功能化的2-甲基-咪唑基-3-酰基ac类(2)的结构修饰,该类化合物具有重要的镇痛作用。为了研究N-杂芳族环和N-酰基hydr部分对镇痛活性的可能药效学贡献,合成了这个新系列(3)。化合物3g和3n是该系列中最有效的镇痛药,筛选剂量为100 mg / kg po和化合物3e,
Intramolecular Cyclization of Azides by Iminium Species. A Novel Method for the Construction of Nitrogen Heterocycles under Vilsmeier Conditions
摘要:
An unprecedented attack of the azide functionality by iminium species, generated in situ under Vilsmeier conditions, provided a novel route for the construction of nitrogen heterocycles. Thus, the treatment of 2-azidoacetophenones with Vilsmeier reagent under reflux conditions gave 5-aryloxazole-4-carboxaldehydes. One-pot synthesis of oxazole carboxaldehydes from 2-bromoacetophenones by dehaloazidation-Vilsmeier cyclization reaction sequence provided better yields. The susceptibility of the carbonyl group to undergo chloroformylation at room temperature without affecting the azide function was exploited to provide an attractive scheme for the synthesis of alpha-azido-beta-chlorovinyl azides from phenacyl azides. The synthesis of a series of N-aryl 5-chloro-2-(dimethylamino)imidazole-4-carboxaldehydes was accomplished by the Vilsmeier cyclization of N-aryl-2-azidoacetamides. The possible mechanisms for the reactions are also discussed.
This paper describes recent results of design, synthesis and pharmacological evaluation of new N-heterocyclic functionalized N-acylhydrazone compounds (NAH), belonging to the N-substituted-phenylimidazolyl-4-acylhydrazone class (3a-o). These compounds were planned by applying the molecular hybridization strategy to propose the structural modifications on the previously described functionalized 2-m
本文介绍了属于N-取代-苯基咪唑基-4-酰基hydr类(3a-o)的新型N-杂环官能化N-酰基hydr化合物(NAH)的设计,合成和药理学评估的最新结果。通过应用分子杂交策略对这些化合物进行规划,以提出对上述功能化的2-甲基-咪唑基-3-酰基ac类(2)的结构修饰,该类化合物具有重要的镇痛作用。为了研究N-杂芳族环和N-酰基hydr部分对镇痛活性的可能药效学贡献,合成了这个新系列(3)。化合物3g和3n是该系列中最有效的镇痛药,筛选剂量为100 mg / kg po和化合物3e,
Intramolecular Cyclization of Azides by Iminium Species. A Novel Method for the Construction of Nitrogen Heterocycles under Vilsmeier Conditions
作者:Vattoly J. Majo、Paramasivan T. Perumal
DOI:10.1021/jo971745z
日期:1998.10.1
An unprecedented attack of the azide functionality by iminium species, generated in situ under Vilsmeier conditions, provided a novel route for the construction of nitrogen heterocycles. Thus, the treatment of 2-azidoacetophenones with Vilsmeier reagent under reflux conditions gave 5-aryloxazole-4-carboxaldehydes. One-pot synthesis of oxazole carboxaldehydes from 2-bromoacetophenones by dehaloazidation-Vilsmeier cyclization reaction sequence provided better yields. The susceptibility of the carbonyl group to undergo chloroformylation at room temperature without affecting the azide function was exploited to provide an attractive scheme for the synthesis of alpha-azido-beta-chlorovinyl azides from phenacyl azides. The synthesis of a series of N-aryl 5-chloro-2-(dimethylamino)imidazole-4-carboxaldehydes was accomplished by the Vilsmeier cyclization of N-aryl-2-azidoacetamides. The possible mechanisms for the reactions are also discussed.