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Cationic Iridium/S‐Me‐BIPAM‐Catalyzed Direct Asymmetric Intermolecular Hydroarylation of Bicycloalkenes
Authors:Tomohiko Shirai  Yasunori Yamamoto
Abstract:Highly enantioselective cationic iridium‐catalyzed hydroarylation of bicycloalkenes, by carbonyl‐directed C? H bond cleavage, was accomplished using a newly synthesized sulfur‐linked bis(phosphoramidite) ligand (S‐Me‐BIPAM). The reaction provides alkylated acetophenone or benzamide derivatives in moderate to excellent yields and good to excellent enantioselectivities. Notably, the hydroarylation reaction of 2‐norbornene with N,N‐dialkylbenzamide proceeds with excellent enantioselectivity (up to 99 % ee) and high selectivity for the mono‐ortho‐alkylation product.
Keywords:Alkene  Alkylierungen  Asymmetrische Synthesen  Iridium  Synthesemethoden
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