Hit-to-lead optimization of pyrrolo[1,2-a]quinoxalines as novel cannabinoid type 1 receptor antagonists
摘要:
Hit-to-lead optimization of a novel series of N-alkyl-N-[2-oxo-2-(4-aryl-4H-pyrrolo[1,2-a]quinoxaline-5yl)-ethyl]-carboxylic acid amides, derived from a high throughput screening (HTS) hit, are described. Subsequent optimization led to identification of in vitro potent cannabinoid 1 receptor (CB1R) antagonists representing a new class of compounds in this area. (C) 2009 Elsevier Ltd. All rights reserved.
Lewis Acid-Catalyzed Selective Synthesis of Diversely Substituted Indolo- and Pyrrolo[1,2-a]quinoxalines and Quinoxalinones by Modified Pictet-Spengler Reaction
作者:Akhilesh K. Verma、Rajeev R. Jha、V. Kasi Sankar、Trapti Aggarwal、Rajendra P. Singh、Ramesh Chandra
DOI:10.1002/ejoc.201101013
日期:2011.12
An efficient tandem process for the selectivesynthesis of 1,2-annulated α-fused quinoxalines using benzotriazole methodology by a modifiedPictet–Spenglerreaction is described. The approach involves the reaction of arylamines 4 with aromatic aldehydes 5 to furnish 6-endo-dig-cyclized products. Dihydroquinoxalines 6 were selectively obtained by using AlCl3 in tetrahydrofuran (THF) at room temperature
An efficient catalytic asymmetric synthesis of 4,5-dihydropyrrolo[1,2-a]quinoxalines has been developed on the basis of the Pictet-Spengler-type condensation of 1-(2-aminophenyl)pyrrole with a wide range of aldehydes. Structurally diverse 4,5-dihydropyrrolo[1,2-a]quinoxaline derivatives were obtained from 1-(2-aminophenyl)pyrrole and both aromatic and aliphatic aldehydes in good yields with moderate to good enantioselectivities upon treatment with chiral phosphoramidate catalyst IVb. (C) 2016 Elsevier Ltd. All rights reserved.