Abstract
AbstractA new enantioselective cyclopropanation of 3‐alkenyl‐oxindoles with sulfoxonium ylides was realized by using a chiral N,N′‐dioxide/Mg(OTf)2 complex as the catalyst. Various chiral spiro‐cyclopropyl oxindoles containing two or three continuous chiral carbon centres were obtained in high yields (up to 99%) with good dr (up to 97:3 dr) and high ee values (up to 94% ee).magnified image
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