“…Since the seminal works of Tsuji on the (3 + 2) cycloaddition of activated vinyl cyclopropanes with acrylates under the effect of palladium catalysis in 1985, significant advancements have been made in this field. Not only activated alkenes but also many other kinds of unsaturated compounds, including aldehydes, ketones, imines, heterocumulenes, as well as allenes, have been successfully used as dipolarophiles in the reaction. In addition, the asymmetric versions of the reaction have been developed rapidly, affording a variety of optically active five-membered heterocycles and cyclopentane derivatives. − ,,,,,, Aromatics have also been applied in an asymmetric dearomatization manner .…”