A one-pot, four-component procedure for the synthesis of novel spiroindenoquinoxalineindolizidines with high regioselectivity and diastereoselectivity from the 1,3-dipolar cycloaddition of azomethine ylides, generated from indenoquinoxalines and pipecolinic acid, and chalcones is described. The reaction occurs under reflux of ethanol as a green solvent and in the absence of any catalyst. The cycloadducts are obtained purely without future purification. The regiochemistry and stereochemistry of resultant cycloadducts have been determined by several 2D-NMR spectroscopic techniques and X-ray single crystal diffraction.
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Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R ChinaHangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R China
Xu, Jiang-Cheng
Li, Wan-Mei
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Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R ChinaHangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R China
Li, Wan-Mei
Zheng, Hui
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Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R ChinaHangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R China
Zheng, Hui
Lai, Yi-Feng
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Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R ChinaHangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R China
Lai, Yi-Feng
Zhang, Peng-Fei
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Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R ChinaHangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310036, Zhejiang, Peoples R China