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Title
Japanese:Enantioselective synthesis of spirocyclic benzopyranones by rhodium-catalyzed intermolecular [4 + 2] annulation. 
English:Enantioselective synthesis of spirocyclic benzopyranones by rhodium-catalyzed intermolecular [4 + 2] annulation. 
Author
Japanese: Daiki Hojo, Keiichi Noguchi, Masao Hirano, Ken. Tanaka.  
English: Daiki Hojo, Keiichi Noguchi, Masao Hirano, Ken. Tanaka.  
Language English 
Journal/Book name
Japanese:Angewandte Chemie, International Edition 
English:Angewandte Chemie, International Edition 
Volume, Number, Page Vol. 47    No. 31    pp. 5820-5822
Published date 2008 
Publisher
Japanese:Wiley-VCH Verlag GmbH & Co. KGaA 
English:Wiley-VCH Verlag GmbH & Co. KGaA 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1002/anie.200801642
Abstract A cationic RhI/(R,R)- walphos complex catalyzes an enantioselective [4 + 2] annulation of 2-alkynylbenzaldehydes with cyclic electron-deficient carbonyl compds. at room temp. Enantioenriched spirocyclic benzopyranones and isatin derivs. are obtained in high yield (up to 97%) and high enantioselectivity (up to > 99%). [on SciFinder(R)]

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