Terpenoid Cyclophanes with Planar Chirality.

The strain-induced chirality of cyclophanes has attracted interest within the synthetic community. Herein, we report the synthesis of anilinocyclophanes derived from naturally occurring terpenes, such as citronellol, geraniol, and farnesol. The resulting cyclic oligoprenyl molecules exhibit considerable ring strain (up to 31 kcal/mol), as evident from their bent aniline planes, and possess chirality across the planes of an aryl ring and double bonds. Unexpected outcomes, such as the formation of isomerized neraniline, highlight the influence of ring strain on the stability and reactivity of terpenoid para -cyclophanes.