1: n-butyl-magnesium bromide With copper(I) bromide dimethylsulfide complex in diethyl ether T=-30°C; 0.166667 h; 2: (E)-1-tosylprop-1-enyl N,N-diisopropylcarbamate in diethyl ether; toluene T=-35°C; 16 h; 3: With formic acid; ammonium chloride in diethyl ether; water; toluene T=-35°C;