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Transition‐metal‐catalyzed [2+2+2] cycloaddition of alkynes is a core synthetic approach to benzene rings. Herein we describe an efficient system based on inexpensive nickel catalyst and phosphine ligand that facilitate cyclotrimerization of various internal esteryl alkynes. The regioselectivity of the protocol was precisely controlled, and a series of polysubstituted benzene rings mainly composed...
Despite recent advances in catalytic ring‐opening/cross‐coupling process of o‐halogen tethered phenylcyclobutanones with other partners, single‐component ring expansion of such precursors towards 3‐methylindanones has not been disclosed. We present herein a nickel catalyzed C−C bond reconstruction sequence of o‐bromophenylcyclobutanones using H2O as hydrogen donor, leading to a series of indanones,...