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Laurence Miesch - One of the best experts on this subject based on the ideXlab platform.
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Spirocyclization of keto ynesulfonamides promoted by quaternary ammonium salts
Organic chemistry frontiers, 2019Co-Authors: Frederic Beltran, Lucile Andna, Laurence MieschAbstract:Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-Spiro Compounds. Exclusive E-configured 5-exo-dig Compounds were isolated from keto-ynesulfonamides substituted by an aryl- or a vinyl group, whereas 6-endo-dig Compounds were favored from terminal ynesulfonamides.
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Spirocyclization of keto-ynesulfonamides promoted by quaternary ammonium salts
Organic Chemistry Frontiers, 2019Co-Authors: Frederic Beltran, Lucile Andna, Laurence MieschAbstract:Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-Spiro Compounds. , Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-Spiro Compounds. Exclusive E -configured 5- exo-dig Compounds were isolated from keto-ynesulfonamides substituted by an aryl- or a vinyl group, whereas 6- endo-dig Compounds were favored from terminal ynesulfonamides.
Chaoguo Yan - One of the best experts on this subject based on the ideXlab platform.
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facile synthesis of Spiro indoline 3 3 pyrrolo 1 2 a quinolines and Spiro indoline 3 1 pyrrolo 2 1 a isoquinolines via 1 3 dipolar cycloaddition reactions of heteroaromatic ammonium salts with 3 phenacylideneoxindoles
Organic and Biomolecular Chemistry, 2012Co-Authors: Jing Sun, Chaoguo YanAbstract:A series of complex Spiro[indoline-3,3′-pyrrolo[1,2-a]quinolines] were efficiently synthesized by 1,3-dipolar cycloaddition reactions of N-phenacylquinolinium bromides with 3-phenacylideneoxindoles in ethanol with triethylamine as base. Under similar conditions the 1,3-cycloadditions of N-phenacylisoquinolinium and N-phenacyl-1,10-phenanthrolinium bromides with 3-phenacylideneoxindoles resulted in the corresponding Spiro[indoline-3,1′-pyrrolo[2,1-a]isoquinoline] and Spiro[benzo[h]pyrrolo[1,2-a]quinoline-3,3′-indoline] derivatives in good yields. The characterization data of Spiro Compounds and single crystal determination indicated that this 1,3-cycloaddition reaction is a regioselective and diastereoselective reaction and all prepared Spiro Compounds exist in the thermodynamically stable trans isomer.
Hong Jiang - One of the best experts on this subject based on the ideXlab platform.
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Intermolecular reductive cyclodimerization of cyclic α,β-unsaturated ketones promoted by a low-valent titanium reagent : A facile synthesis of some new Spiro Compounds
Synthesis, 2007Co-Authors: Daqing Shi, Guolan Dou, Chunling Shi, Hong JiangAbstract:The intermolecular reductive cyclodimerization reactions of cyclic α,β-unsaturated ketones such as 2-benzylideneindan-1-ones, 2-benzylidene-1 -tetralones, 3-benzylidenechroman-4-ones, and 3-benzylidenethiochroman-4-ones induced by a low-valent titanium reagent were studied. Some new Spiro Compounds were prepared in good yields under neutral and mild conditions. High stereoselectivity was achieved and the stereochemistry of the products was confirmed by X-ray diffraction analysis.
Ayoob Bazgir - One of the best experts on this subject based on the ideXlab platform.
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Organic Reaction in Water: A Highly Efficient and Environmentally Friendly Synthesis of Spiro Compounds Catalyzed by L‐Proline
Helvetica Chimica Acta, 2011Co-Authors: Minoo Dabiri, Zeinab Noroozi Tisseh, Mohsen Nobahar, Ayoob BazgirAbstract:We have developed a clean, simple and efficient method for the synthesis of Spiro Compounds by three-component reaction of isatins (=1H-indole-2,3-diones) or acenaphthylene-1,2-dione, 1,3-diphenyl-1H-pyrazoles-5-amines, and tetronic acid (=furan-2,4-(3H,5H)-dione or 2-hydroxy-1,4-naphthoquinone in the presence of a catalytic amount of L-proline in aqueous media. The advantages of this procedure are mild reaction conditions, high yields of products, operational simplicity, and easy workup procedures employed.
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organic reaction in water a highly efficient and environmentally friendly synthesis of Spiro Compounds catalyzed by l proline
Helvetica Chimica Acta, 2011Co-Authors: Minoo Dabiri, Zeinab Noroozi Tisseh, Mohsen Nobahar, Ayoob BazgirAbstract:We have developed a clean, simple and efficient method for the synthesis of Spiro Compounds by three-component reaction of isatins (=1H-indole-2,3-diones) or acenaphthylene-1,2-dione, 1,3-diphenyl-1H-pyrazoles-5-amines, and tetronic acid (=furan-2,4-(3H,5H)-dione or 2-hydroxy-1,4-naphthoquinone in the presence of a catalytic amount of L-proline in aqueous media. The advantages of this procedure are mild reaction conditions, high yields of products, operational simplicity, and easy workup procedures employed.
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one pot and three component synthesis of Spiro chromeno 2 3 d pyrimidine 5 3 indoline diones and Spiro chromeno 2 3 c pyrazole 4 3 indoline diones
ChemInform, 2010Co-Authors: Ramin Ghahremanzadeh, Fatemeh Fereshtehnejad, Zahra Yasaei, Tayebeh Amanpour, Ayoob BazgirAbstract:Novel Spiro Compounds containing a chromene ring fragment are synthesized under environmentally friendly conditions.
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One‐Pot and Three‐Component Synthesis of Spiro[chromeno[2,3‐d]pyrimidine‐5,3′‐indoline]‐diones and Spiro[chromeno[2,3‐c]pyrazole‐4,3′‐indoline]‐diones.
ChemInform, 2010Co-Authors: Ramin Ghahremanzadeh, Fatemeh Fereshtehnejad, Zahra Yasaei, Tayebeh Amanpour, Ayoob BazgirAbstract:Novel Spiro Compounds containing a chromene ring fragment are synthesized under environmentally friendly conditions.
Frederic Beltran - One of the best experts on this subject based on the ideXlab platform.
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Spirocyclization of keto ynesulfonamides promoted by quaternary ammonium salts
Organic chemistry frontiers, 2019Co-Authors: Frederic Beltran, Lucile Andna, Laurence MieschAbstract:Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-Spiro Compounds. Exclusive E-configured 5-exo-dig Compounds were isolated from keto-ynesulfonamides substituted by an aryl- or a vinyl group, whereas 6-endo-dig Compounds were favored from terminal ynesulfonamides.
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Spirocyclization of keto-ynesulfonamides promoted by quaternary ammonium salts
Organic Chemistry Frontiers, 2019Co-Authors: Frederic Beltran, Lucile Andna, Laurence MieschAbstract:Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-Spiro Compounds. , Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-Spiro Compounds. Exclusive E -configured 5- exo-dig Compounds were isolated from keto-ynesulfonamides substituted by an aryl- or a vinyl group, whereas 6- endo-dig Compounds were favored from terminal ynesulfonamides.