Abstract The [1+ 2] cycloaddition of ethyl nitrodiazoacetate to various methylenecyclopropanes afforded 1-ethoxycarbonyl-1-nitropolyspirocyclopropanes. These compounds were used in the synthesis of first representatives of nitrosubstituted triangulanes. Nitrospiropentane was prepared also by dehydrohalogenation of 1- bromomethyl-1-(nitromethyl) cyclopropane.
