Abstract
Main observation and conclusionThe [8+4] cycloaddition of indene‐2‐carbaldehydes with indole‐2,3‐quinodimethanes and pyrrolidone‐3,4‐dienes is described, affording indole and pyrrolidone annulated bicyclo[4.2.1]nonanes in a highly peri‐, diastereo‐, and enantioselective fashion in the presence of a secondary amine catalyst. This reaction, which proceeds through catalytically generated isobenzofulvenes, represents the first asymmetric version of high‐order [8+4] cycloaddition.
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