The application of natural eutectic solvent (NDDES) in organic synthesis has received more and more attention. In this work, a green protocol for one-pot synthesis of spiro[indoline-3,4'-pyrazolo[3,4-b]pyridines] via three-component reactions of 1H-pyrazol-5-amin, isatin and enolizable C-H activated compound is achieved by the combination of microwave irradiation with choline chloride and lactic acid based NDDES. This novel method is clean, cheap, simple, high yield, chromatography-free and scalable. The use of choline chloride and lactic acid as a biodegradable, recycled and reusable media meets most of the criteria to be considered as a sustainable and environmentally benign process. (C) 2019 Elsevier B.V. All rights reserved.
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Jilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Yanbian Univ, Coll Sci, Yanji 133000, Jilin, Peoples R ChinaJilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Sun, Yuhong
Jin, Yan
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Yanbian Univ, Coll Sci, Yanji 133000, Jilin, Peoples R ChinaJilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Jin, Yan
Gu, Yingying
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Jilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R ChinaJilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Gu, Yingying
Liu, Jinming
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Jilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R ChinaJilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Liu, Jinming
Wang, Liming
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Jilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R ChinaJilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Wang, Liming
Jin, Ying
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Jilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China
Yanbian Univ, Coll Sci, Yanji 133000, Jilin, Peoples R ChinaJilin Med Univ, Dept Pharm, Jilin 132013, Jilin, Peoples R China