- Effect of heterocyclic ring on LnIII coordination, luminescence and extraction of diamides of 2,2′-Bipyridyl-6,6′-dicarboxylic acid
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We have synthesized and examined several complexes of lanthanides with diamides of 2,2′-bipyridyl-6,6′-dicarboxylic acid bearing various hetaryl-based side chains for the elucidation of the effect of the heterocycle on the structure and properties of the ligands. The multigram scale methods for the preparation of various N-alkyl-hetaryls and their diamides were developed. The solid state structure of 6-methyl-2-pyridylamide of 2,2′-bipyridyl-6,6′-dicarboxylic acid possesses a flat structurewhere the conformation is completely different fromthat previously observed forN-alkylated 2,2′-bipyridyl-6,6′-dicarboxamides and 2,6-pyridinedicarboxamides. The complexes of new ligands were synthesized and NMR and X-Ray studied their structure in solution and solid state. The results demonstrate that complexes possess the same structures both in solid state and in solution. Stability constants of the complexes were less when comparing with dimethyl-substituted diamides, but higher than for unsubstituted dianilide. Contrarily, the extraction ability of 2-pyridyl-diamide is significantly lower than for corresponding anilide. Specific interaction of extractant with solvent molecules, which is not available for electron-sink pyridine amides, can explain this. The luminescence of new Eu complexes was significantly higher than for all previously 2,2′-bipyridyl-6,6′-dicarboxamides and QY reaches 18%. Asymmetry ratios of Eu complexes were 25% higher when compared other complexes with 2,2′-bipyridyl-6,6′-dicarboxamides, which indicates large deviation from the inversion center.
- Borisova, Nataliya E.,Ivanov, Alexey V.,Kharcheva, Anastasia V.,Matveev, Petr I.,Patsaeva, Svetlana V.,Sumyanova, Tsagana B.,Surkova, Uliana V.
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- B(C6F5)3-Catalyzed Deoxygenative Reduction of Amides to Amines with Ammonia Borane
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The first B(C6F5)3-catalyzed deoxygenative reduction of amides into the corresponding amines with readily accessible and stable ammonia borane (AB) as a reducing agent under mild reaction conditions is reported. This metal-free protocol provides facile access to a wide range of structurally diverse amine products in good to excellent yields, and various functional groups including those that are reduction-sensitive were well tolerated. This new method is also applicable to chiral amide substrates without erosion of the enantiomeric purity. The role of BF3 ? OEt2 co-catalyst in this reaction is to activate the amide carbonyl group via the in situ formation of an amide-boron adduct. (Figure presented.).
- Pan, Yixiao,Luo, Zhenli,Han, Jiahong,Xu, Xin,Chen, Changjun,Zhao, Haoqiang,Xu, Lijin,Fan, Qinghua,Xiao, Jianliang
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supporting information
p. 2301 - 2308
(2019/01/30)
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- Boron Lewis Acid Promoted Ruthenium-Catalyzed Hydrogenation of Amides: An Efficient Approach to Secondary Amines
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The hydrogenation of amides to amines has been developed by using the catalyst [Ru(H)2(CO)(Triphos)] (Triphos=1,1,1-tri(diphenylphosphinomethyl)ethane) and catalytic boron Lewis acids such as B(C6F5)3 or BF3?Et2O as additives. The reaction provides an efficient method for the preparation of secondary amines from amides in good yields with high selectivity.
- Yuan, Ming-Lei,Xie, Jian-Hua,Zhou, Qi-Lin
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p. 3036 - 3040
(2016/10/11)
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- Deoxygenative Hydrogenation of Amides Catalyzed by a Well-Defined Iridium Pincer Complex
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The iridium-catalyzed highly chemoselective hydrogenation of amides to amines has been developed. Using a well-defined iridium catalyst bearing a P(O)C(O)P pincer ligand combined with B(C6F5)3, the C-O cleavage products are formed under mild reaction conditions. The reaction provides a new method for the preparation of amines from amides in good yield with high selectivity.
- Yuan, Ming-Lei,Xie, Jian-Hua,Zhu, Shou-Fei,Zhou, Qi-Lin
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p. 3665 - 3669
(2016/07/06)
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- Palladium-catalyzed amination of aryl chlorides and bromides with ammonium salts
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We report the palladium-catalyzed coupling of aryl halides with ammonia and gaseous amines as their ammonium salts. The coupling of aryl chlorides and ortho-substituted aryl bromides with ammonium sulfate forms anilines with higher selectivity for the primary arylamine over the diarylamine than couplings with ammonia in dioxane. The resting state for the reactions of aryl chlorides is different from the resting state for the reactions of aryl bromides, and this change in resting states is proposed to account for a difference in selectivities for reactions of the two haloarenes.
- Green, Rebecca A.,Hartwig, John F.
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supporting information
p. 4388 - 4391
(2015/01/08)
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- Cationic iridium-catalyzed enantioselective activation of secondary sp 3 C-H bond adjacent to nitrogen atom
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A cationic Ir(I)-tolBINAP complex catalyzed an enantioselective C-C bond formation, which was initiated by secondary sp3 C-H bond cleavage adjacent to nitrogen atom. A wide variety of 2-(alkylamino)pyridines and alkenes were selectively transformed into the corresponding chiral amines with moderate to almost perfect enantiomeric excesses. Alkynes were also investigated as coupling partners. The effect of alkyl structure in substrates and directing groups were studied. This transformation represents the first example of a highly enantioselective C-H bond activation of a methylene group, not at allylic or benzylic position.
- Pan, Shiguang,Matsuo, Yusuke,Endo, Kohei,Shibata, Takanori
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p. 9009 - 9015
(2012/10/30)
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- 1,2,4-TRIAZINE-4-AMINE DERIVATIVES
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According to the invention there is provided a compound of formula A1 which may be useful in the treatment of a condition or disorder ameliorated by the inhibition of the A1- A2b or, particularly, the A2a receptor wherein the compound of formula A1 has the structure, wherein, A represents Cy1 or HetA; Cy1 represents a 5- to 14-membered aromatic, fully saturated or partially unsaturated carbocyclic ring system comprising one, two or three rings, which Cy1 group is optionally substituted by one or more R4a substituents; HetA represents a 5- to 14-membered heterocyclic group that may be aromatic, fully saturated or partially unsaturated, and which contains one or more heteroatoms selected from O, S and N, which heterocyclic group may comprise one, two or three rings and which HetA group is optionally substituted by one or more R4b substituents; B represents a Cy2 or HetB; Cy2 represents a 3- to 10-membered aromatic, fully saturated or partially unsaturated carbocyclic ring system comprising one or two rings, which Cy2 group is optionally substituted by one or more R4c substituents; HetB represents a 3- to 10-membered heterocyclic group that may be aromatic, fully saturated or partially unsaturated, and which contains one or more heteroatoms selected from O, S and N, which heterocyclic group may comprise one or two rings and which HetB group is optionally substituted by one or more R4d substituents.
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Page/Page column 111
(2011/09/14)
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- Synthesis and β-blocking activity of (R,S)-(E)-oximeethers of 2,3-dihydro-1,8-naphthyridine and 2,3-dihydrothiopyrano[2,3-b]pyridine: Potential antihypertensive agents - Part IX
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The synthesis of oximeethers of 2,3-dihydro-1,8-naphthyridine and 2,3-dihydrothiopyrano[2,3-b]pyridine is described. These compounds exhibit a selective β-blocking activity, with a selectivity towards β2-receptors. Groups in the N1 position giving rise to a considerable steric hindrance led to a higher β2-blocking selectivity, whereas groups creating a moderate hindrance caused a weak but significant decrease in β2-antagonist potency. Substitution of the N1-R group with a sulfur atom led to compounds possessing β1-, β2- and β3-blocking properties. Compounds 9c1 and 10a1 showed a β3-antagonist activity slightly lower than that of propranolol. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
- Ferrarini, Pier Luigi,Mori, Claudio,Badawneh, Muwaffag,Calderone, Vincenzo,Greco, Rosamiria,Manera, Clementina,Martinelli, Adriano,Nieri, Paola,Saccomanni, Giuseppe
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p. 815 - 826
(2007/10/03)
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- Solid phase synthesis of aryl and heteroaryl amines using the Curtius rearrangement
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An efficient method for the solid phase synthesis of secondary aryl amines and heteroaryl amines was developed. The key step was the formation of aryl or heteroaryl carbamates using the Curtius rearrangement of aryl carboxylic acids with Wang resin as a trapping hydroxyl group. N-alkylation reactions of resin-bound carbamates under the Mitsunobu condition or using sodium hydride gave secondary aryl or heteroaryl amines in good yields. The developed method can be applied in the preparation of libraries containing aryl and heteroaryl amine structures as a pharmacophore.
- Sunami, Satoshi,Sagara, Takeshi,Ohkubo, Mitsuru,Morishima, Hajime
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p. 1721 - 1724
(2007/10/03)
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- Ink jet recording ink containing an azomethine dye
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A recording method comprising the step of ejecting an in jet recording ink on an ink receiving material using an ink jet printer, the ink comprising a dye represented by the following Formula (1):
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- The Chemistry of N-Substituted Benzotriazoles. Part 4. A Novel and Versatile Method for the Mono-N-alkylation of Aromatic and Heteroaromatic Amines
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Mono-N-alkylation of aromatic and heteroaromatic amines is achieved in high yield by NaBH4 reduction of the adducts formed from benzotriazole, aliphatic aldehydes and the amines.Reaction of the same adducts with Grignard reagents gives N-(secondary alkyl)arylamines.Carboxy groups need no protection and nitro groups are unaffected.Adenine is mono-N-alkylated in high yield.
- Katritzky, Alan R.,Rachwal, Stanislaw,Rachwal, Bogumila
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p. 805 - 810
(2007/10/02)
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