Ni-Catalyzed Intramolecular Cycloaddition of Methylenecyclopropanes to Alkynes
摘要:
Ni-catalyzed intramolecular cycloaddition of methylenecyclopropanes (MCPs) to arkylalkynes via proximal bond cleavage is reported. The reaction provides a facile route for the preparation of cyclopenta[a]indene derivatives.
A silver(I)-catalyzed reaction of 1-((cyclopropylidenemethyl)-2-alkynyl)arene with 2-alkynylbenzaldoxime leads to 1-((1,3-dihydroisobenzofuran-1-yl)methyl)isoquinolines in good to excellent yields. A radical process is believed to be involved in the transformation.