Organocatalytic Asymmetric Conjugate Addition of 3-Monosubstituted Oxindoles to (<i>E</i>)-1,4-Diaryl-2-buten-1,4-diones: A Strategy for the Indirect Enantioselective Furanylation and Pyrrolylation of 3-Alkyloxindoles
3′‐disubstituted oxindoles—3‐furanyl‐ and 3‐pyrrolyl‐3‐alkyl‐oxindoles—in high yields and good enantioselectivities. Notably, the studies presented here sufficiently confirm that this two‐step strategy of sequential conjugate addition/Paal–Knorr cyclization is not only an attractive method for the indirect enantioselective heteroarylation of 3‐alkyloxindoles, but also opens up new avenues toward asymmetric synthesis