- Bioorthogonal Ligation and Cleavage by Reactions of Chloroquinoxalines with ortho-Dithiophenols
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A bioorthogonal ligation and cleavage method via reactions of chloroquinoxalines (CQ) and ortho-dithiophenols (DT) is presented. Double nucleophilic substitutions of ortho-dithiophenols to chloroquinoxalines provide conjugates containing tetracyclic benzo[5,6][1,4]dithiino[2,3-b]quinoxaline with strong built-in fluorescence together with release of the other functional molecules. Three cleavable linkers were designed and successfully used in release of the molecules containing biotin from the protein conjugates. The CQ-DT bioorthogonal reactions can be applied for the bioorthogonal ligations, bioorthogonal cleavages, and trans-tagging of proteins, and show advantages of readily accessible unnatural orthogonal groups, appealing reaction kinetics (k2≈1.3 m?1 s?1), excellent biocompatibility of orthogonal groups, and high stability of conjugates. This complements previous bioorthogonal reactions and is a new route for protein-fishing applications and in-gel fluorescence analysis.
- Fu, Hua,Li, Hongyun,Li, Youshan,Lou, Zhenbang,Yang, Haijun,Zhao, Yufen
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p. 3671 - 3677
(2020/02/04)
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- Development of an unexpected reaction pathway for the synthesis of 1,2,4-trisubstituted pyrrolo[1,2-a]quinoxalines through palladium-catalyzed cascade reactions
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1,2,4-trisubstituted pyrrolo[1,2-a]quinoxalines are synthesized through the multi-component reaction of 3-substituted 2-chloroquinoxalines, propargyl bromide, and excess secondary amines in the presence of a palladium copper catalytic system. This one-pot process provides an unexpected synthesis of new trisubstituted pyrrolo[1,2-a]quinoxalines by the introduction of two amine substituents onto the fused pyrrole rings in a single reaction procedure. The compounds formed are fully characterized by the analytical spectral data and X-ray analysis. A number of synthesized pyrrolo[1,2-a]quinoxaline derivatives are also screened against the three bacterial strains Micrococcus luteus, Pseudomonas aeruginos, and Bacillus subtilis. According to the results obtained, compounds 3b, 3c, and 3e are active against M.?luteus, compounds 3b and 3e are active against Ps. Aeruginos, and only compound 3f is active against all the three bacterial strains.
- Keivanloo, Ali,Soozani, Atena,Bakherad, Mohammad,Mirzaee, Mahdi,Rudbari, Hadi Amiri,Bruno, Giuseppe
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p. 1633 - 1639
(2017/03/08)
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- Novel multi-component synthesis of 1,4-disubstituted pyrrolo[1,2-a]quinoxalines through palladium-catalyzed coupling reaction/hetero-annulation in water
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1,4-Disubstituted pyrrolo[1,2-a]quinoxalines were prepared through the one-pot multi-component reactions of 3-substituted-2-chloroquinoxalines, propargyl alcohol, and secondary amines, catalyzed by Pd/Cu, in the presence of K2CO3and sodium dodecyl sulfate (SDS) in water. This process provided a facile, eco-friendly, and highly efficient method for the synthesis of new pyrrolo[1,2-a]quinoxalines in water with good yields.
- Keivanloo, Ali,Kazemi, Shaghayegh Sadat,Nasr-Isfahani, Hossein,Bamoniri, Abdolhamid
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supporting information
p. 6536 - 6542
(2016/09/23)
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- AROMATIC NITROGEN-CONTAINING 6-MEMBERED RING COMPOUNDS AND THEIR USE
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The present invention provides aromatic nitrogen-containing 6-membered ring compounds having execellent PDE10 inhibitory activity. The present invention relates to an aromatic nitrogen-containing 6-membered ring compound represented by the following formula [I0] or a pharmaceutically acceptable salt thereof, a method for preparing the same, and use of said compounds for PDE10 inhibitors, and a pharmaceutical composition comprising said compounds as an active ingredient: Formula [I0] wherein: X1, X2 and X3 each independently are N or CH, and at least two of X1, X2 and X3 are N; A is *-CH=CH-, *-C(Alk)=CH-, *-CH2-CH2- or *-O-CH2- (* is a bond with R1); Alk is a lower alkyl group; Ring B is an optionally substituted nitrogen-containing aliphatic heterocyclic group; R1 is an optionally substituted nitrogen-containing heterocyclic group, a nitrogen-containing heterocyclic moiety of which is a moiety selected from the group consisting of quinoxalinyl, quinolyl, isoquinolyl, quinazolinyl, pyrazinyl, pyrimidinyl and a moiety thereof fused with a 5 to 6-membered aliphatic ring thereto; Y0 is a group selected from the group consisting of the following (1) to (5): (1) an optionally substituted phenyl or an optionally substituted aromatic monocyclic 5 to 6-membered heterocyclic group; (2) an optionally substituted aminocarbonyl; (3) an optionally substituted amino lower alkyl; (4) -O-R2 wherein R2 is hydrogen, an optionally substituted lower alkyl, lower cycloalkyl, aliphatic monocyclic 5 to 6-membered heterocyclic group, or Formula [AA]; (5) mono- or di-substituted amino; provided that, when Y0 is mono- or di-substituted amino, the nitrogen-containing heterocyclic moiety of R1 is not quinoxalinyl or quinolyl.
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Page/Page column 60
(2010/04/06)
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