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Nitroethylene. -The title catalyst is successfully applied in asymmetric 1,4-addition of 3'-indolyl-3-oxidole to nitroethylene. The mixed 3,3'-bisindole products are obtained with high enantioselectivity. The non-protected and N-acyl substrates on the oxindole site do not react.The biologically important 3'-indolyl-3-pyrrolidinoindoline (IV) can be synthesized in three steps. -(AWATA, A.; WASAI, M.; MASU, H.; KADO, S.; ARAI*, T.; Chem. -Eur.