Formal intermolecular [2 + 2] cycloaddition reaction of allenamide [corrected] with alkenes via gold catalysis

An efficient method was developed to construct the densely functionalized cyclobutanecorrected] adducts through formal intermolecular cycloaddition of allenamides corrected] with electron-rich olefins via gold catalysis, in which vinyl ethers/amides and electron-rich styrenes worked very well. In addition, a series of allenamide corrected] dimerization products were prepared from the same allenamide corrected] substrates.