Metal-free visible-light-promoted intermolecular [2+2]-cycloaddition of 3-ylideneoxindoles |
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| Authors: | Ling-Ling Wu Gao H Yang Zhi Guan Yan-Hong He |
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| Institution: | 1. Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China;2. Chemistry Department, College of Saint Benedict and Saint John''s University, MN 56374, USA |
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| Abstract: | The Rose Bengal sensitized intermolecular 2 + 2]-cycloaddition of 3-ylideneoxindoles for the synthesis of spirocyclic oxindoles was developed successfully under visible light irradiation conditions. The cycloaddition products were obtained in good yields (up to 93%) with excellent diastereoselectivity and regioselectivity by using a low loading of Rose Bengal (0.125 mol%) as a triplet sensitizer. This work demonstrates the potential benefits of Rose Bengal in visible light catalysis. |
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| Keywords: | Visible light Rose Bengal 3-ylideneoxindoles [2+2]-cycloaddition Spirocyclic oxindoles |
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