A series of fused 6,6-bicyclic chromenones was investigated for activity against the bradykinin B1 receptor. SAR studies based on a pharmacophore model revealed compounds with high affinity for both human and rabbit B1. These compounds demonstrated favorable pharmacokinetic properties and 5-chlorochromenone 15 was efficacious in a carrageenan-induced mechanical hyperalgesia model for chronic pain. (C) 2011 Elsevier Ltd. All rights reserved.
Zn(OTf)<sub>2</sub>-Catalyzed Formal [3 + 3] Cascade Annulation of Propargylic Alcohols with 2-Aminochromones: Accessing the Chromeno[2,3-<i>b</i>]pyridines
作者:Pei Tong、Zhou Sun、Shutao Wang、Yuan Zhang、Ying Li
DOI:10.1021/acs.joc.9b02120
日期:2019.11.1
A Zn(OTf)2-catalyzed formal [3 + 3] cascade annulation strategy for the synthesis of functionalized chromeno[2,3-b]pyridines has been developed using propargylicalcohols and 2-aminochromones as the substrates. The protocol provides a convenient and atom-economical method of accessing a broad range of chromeno[2,3-b]pyridine derivatives in excellent yields with good functional-group tolerance. The
Synthesis of 3-halochromones with simple KX halogen sources enabled by <i>in situ</i> halide oxidation
作者:Yan Lin、Jie-Ping Wan、Yunyun Liu
DOI:10.1039/d0nj00825g
日期:——
On the basis of a designated in situ oxidation tactic, the synthesis of 3-halochromones has been realized for the first time by using simple KX (X = Br, I) salts as halogen sources. Instead of the free radical process, the control experiments indicate that the reported reactions proceed through a halogenium intermediate. Compared to the known synthetic methods relying on molecular halogen, haloid acid
Synthesis of 3,4,5‐Trisubstituted Isoxazoles via the ANRORC Rearrangement
作者:Venu Kandula、Sravan K. Bandaru、C. Balakrishna、Anindita Chatterjee、Satyanarayana Yennam、Graham C. Saunders、Manoranjan Behera
DOI:10.1002/ejoc.202001103
日期:2020.11.8
A facile and versatile procedure for the synthesis of functionalized 3‐benzyl‐5‐(2‐hydroxyphenyl) isoxazole‐4‐carbaldehyde oxime derivatives has been described. The key step in the synthesis involves the ANRORC reaction of in‐situ generated 3‐(phenylethynyl)‐4H‐chromen‐4‐one with NH2OH·HCl.
An efficient synthesis of 4H-chromene-4-ones via enamino ketones, with cyclization by using T3P® under microwave heating is described. This is the first report for the synthesis of chromones by using T3P®. Significant features of this method include short reaction times and high-purity products.
Selectfluor-Mediated Tandem Cyclization of Enaminones for the Synthesis of 3-Fluorochromones
作者:Venu Kandula、Pradeep Kumar Thota、Poosa Mallesham、K. Raghavulu、Anindita Chatterjee、Satyanarayana Yennam、Manoranjan Behera
DOI:10.1055/s-0039-1691489
日期:2019.12
An efficient synthesis of various 3-fluorochromones (3-fluoro-4H-chromene-4-ones) fromenaminoketones by using Selectfluor is described. The key step in the synthesis involves tandem fluorination and cyclization to form 3-fluorochromones in good yields. The significant features of this method include simple operational procedures, a high purity of the product, and excellent regioselectivity.