Asymmetric synthesis of pyrrolo[1,2-a]indoles via organocatalytic [3 +2] annulation of substituted 2

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The chiral phosphoric acid catalyzed asymmetric [3+2] annulation of substituted 2-vinylindoles with azlactones has been established. This reaction represented a practical approach for the synthesis of structurally diverse pyrrolo[1,2-a]indoles with two vicinal stereocenters including one tetrasubstituted stereocenter in good yields and good stereoselectivities under mild conditions.
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