ChemInform Abstract: Enantioselective [4 + 2] Cycloadditions of 2-Vinyl-1H-indoles with 3-Nitro-2H-chromenes Catalyzed by a Zn(OTf)2/Bis(oxazoline) Complex: An Efficient Approach to Fused Heterocycles with a Quaternary Stereocenter.

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