Iridium‐Catalyzed Asymmetric Hydrogenation of Unfunctionalized Exocyclic C=C Bonds |
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Authors: | Jingzhao Xia Dr Guoqiang Yang Ruijing Zhuge Prof?Dr Yangang Liu Prof?Dr Wanbin Zhang |
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Institution: | 1. School of Pharmacy, Shanghai Jiao Tong University, Shanghai, P. R. China;2. http://wanbin.sjtu.edu.cn;3. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, P. R. China |
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Abstract: | An iridium‐catalyzed asymmetric hydrogenation of unfunctionalized exocyclic C=C bonds was performed by using an axially flexible chiral phosphine–oxazoline ligand, providing the desired chiral 1‐benzyl‐2,3‐dihydro‐1H‐indene products with up to 98 % ee (enantiomeric excess). This represents the first general hydrogenation of unfunctionalized exocyclic olefins with high selectivity reported thus far. The additive acetate ion plays an important role in the reaction's high enantioselectivity. The chiral product can be further transformed into key intermediates required for the synthesis of an important insecticide and a drug compound. |
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Keywords: | asymmetric hydrogenation exocyclic olefins iridium phosphine– oxazoline ligands unfunctionalized olefins |
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