INTAMOLECULAR CYCLIZATION MEDIATED BY SILYLMETALATION OF ACETYLENES WITH PhMe2SiMgMe/CuI AND RADICAL NATURE OF THE REAGENT

Article abstract of DOI:10.1016/S0040-4039(01)81210-7

Whereas CuI catalyzed silylmagnesation of the tosylate of 5-hexyn-1-ol with the title reagent affords dimethylphenylsilylmethylenecyclopentane exclusively, the mesylate of 3-butyn-1-ol gives a mixture of unexpected silylcyclobutene and cyclopropylidene derivative.